SECURITIES AND EXCHANGE COMMISSION
Washington, D. C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

CONSTAR INTERNATIONAL INC.
(Name of Issuer)

Common Stock, $.01 par value per share
(Title and Class of Securities)

21036U107 - Common Stock
(CUSIP Numbers)

November 14, 2008
(Date of Event which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this schedule
is filed:

|_| Rule 13d-1(b)
[x] Rule 13d-1(c)
|_| Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 (the "Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).


CUSIP No. 21036U107 Page 2 of 5 Pages

--------------------------------------------------------------------------------
1 NAMES OF REPORTING PERSONS
 S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

 Hammerstone NV, Inc., IRS number 20-2689613
--------------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_|
 (b) |_|

--------------------------------------------------------------------------------
3 SEC USE ONLY

--------------------------------------------------------------------------------
4 CITIZENSHIP OR PLACE OF ORGANIZATION

 New York
--------------------------------------------------------------------------------
 5 SOLE VOTING POWER

 650,000
 ----------------------------------------------------------------
 NUMBER OF 6 SHARED VOTING POWER
 SHARES
BENEFICIALLY 0
 OWNED BY ----------------------------------------------------------------
 EACH 7 SOLE DISPOSITIVE POWER
 REPORTING
 PERSON 650,000
 WITH ----------------------------------------------------------------
 8 SHARED DISPOSITIVE POWER

 0
--------------------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 650,000
--------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

 |_|
--------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

 5.02%
--------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*

 Hammerstone NV, Inc. - CO
--------------------------------------------------------------------------------


 2


CUSIP No. 21036U107 Page 3 of 5 Pages

Item 1(a). Name of Issuer:

 Constar International Inc.

Item 1(b). Address of Issuer's Principal Executive Offices:

 1 Crown Way, Philadelphia, Pennsylvania 19154

Item 2(a). Name of Person Filing:

 Hammerstone NV, Inc.

Item 2(b). Address of Principal Business Office or, if None, Residence:

 650 Fifth Avenue, 6th Floor, New York, New York 10019

Item 2(c). Citizenship:

 Not Applicable.

Item 2(d). Title of Class of Securities:

 Common Stock, $.01 par value.

Item 2(e). CUSIP Numbers:

 21036U107 - Common Stock

Item 3. If this statement is filed pursuant to Rule 13d-1(b), or 13d-2(b) or
 (c), check whether the person filing is a:

 (a) |_| Broker or Dealer registered under Section 15 of the Act.

 (b) |_| Bank as defined in Section 3(a)(6) of the Act.

 (c) |_| Insurance Company as defined in Section 3(a)(19) of the Act.

 (d) |_| Investment Company registered under Section 8 of the Investment
 Company Act.

 (e) |_| Investment Adviser registered in accordance with Rule
 13d-1(b)(1)(ii)(E).


 3


CUSIP No. 21036U107 Page 4 of 5 Pages

 (f) |_| Employee Benefit Plan or Endowment Fund in accordance with Rule
 13d-1(b)(1)(ii)(F).

 (g) |_| Parent Holding Company or control person in accordance with Rule
 13d-1(b)(1)(ii)(G).

 (h) |_| A savings association as defined in Section 3(b) of the Federal
 Deposit Insurance Act.

 (i) |_| A church plan that is excluded from the definition of an
 investment company under Section 3(c) (14) of the Investment
 Company Act of 1940.

 (j) |_| Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

 If this Statement is filed pursuant to Rule 13d-1(c), check this
 box |X|.

Item 4. Ownership.

 (a) Amount beneficially owned: 650,000

 (b) Percent of Class: 5.02%

 (c) Number of Shares as to which the person has:

 (i) Sole power to vote or to direct the vote:
 650,000

 (ii) Shared power to vote or to direct the vote:
 0

 (iii) Sole power to dispose or to direct the disposition of:
 650,000

 (iv) Shared Power to dispose or to direct the disposition of:
 0

Item 5. Ownership of Five Percent or Less of a Class.

 If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following.|_|.

Item 6 Ownership of More than Five Percent on Behalf of Another Person.

 Not Applicable.

Item 7. Identification and Classification of the Subsidiary Which Acquired
 the Security Being Reported on by the Parent Holding Company.

 Not Applicable.


 4


CUSIP No. 21036U107 Page 5 of 5 Pages

Item 8. Identification and Classification of Members of the Group.

 Not Applicable

Item 9. Notice of Dissolution of Group.

 Not Applicable.

Item 10. Certification.

 By signing below, I certify that, to the best of my knowledge and
 belief, the securities referred to above were not acquired and are
 not held for the purpose of or with the effect of changing or
 influencing the control of the issuer of the securities and were not
 acquired and are not held in connection with or as a participant in
 any transaction having that purpose or effect.

 SIGNATURE

Date: November 24, 2008 Hammerstone NV, Inc.


 By: /s/ James F. Lissette
 --------------------------------
 Name: James F. Lissette
 Title: President


 5

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