THIS PROMISSORY NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"). THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT ONLY AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENC

PROMISSORY NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"). THIS NOTE HAS

BEEN ACQUIRED FOR INVESTMENT ONLY AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF REGISTRATION OF THE RESALE THEREOF UNDER

THE SECURITIES ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY IN FORM, SCOPE AND SUBSTANCE TO THE COMPANY THAT SUCH REGISTRATION

Acquisition, Inc., a Delaware corporation (the "Maker"), promises to pay to the order of Pine Valley Investments LLC

or its registered assigns or successors in interest (the "Payee") the principal sum of up to Eight Hundred Fifty Thousand

Dollars ($850,000) in lawful money of the United States of America, on the terms and conditions described below. All payments on this

promissory note (this "Note") shall be made by check or wire transfer of immediately available funds or as otherwise

determined by Maker to such account as the Payee may from time to time designate by written notice in accordance with the provisions

Petra Acquisition, Inc.

Valley Investments LLC

Harry Morad, Managing Partner

shall be deemed given on the earlier of (i) actual receipt by the receiving party, (ii) the date shown on a facsimile transmission confirmation,

(iii) the date reflected on a signed delivery receipt, or (iv) two (2) Business Days following tender of delivery or dispatch by express

mail or delivery service.

anything herein to the contrary, Payee hereby agrees that he, she or it does not have any right, title, interest or claim of any kind

in or to any monies in the Trust Account and hereby agrees that, he, she or it will not seek recourse against the Trust Account for any

claim it may have in the future as a result of, or arising out of, any negotiations, contracts or agreements with the Maker; provided

that (a) nothing herein shall serve to limit or prohibit Payee's right to pursue a claim against the Maker for legal relief against

monies or other assets held outside the Trust Account, for specific performance or other equitable relief in connection with the consummation

of the transactions contemplated hereby (including a claim against the Maker to specifically perform its obligations under this Note)

so long as such claim would not affect the Maker's ability to fulfill its obligation to effectuate any redemption, and (b) nothing

herein shall serve to limit or prohibit any claims that Payee may have in the future against the Maker's assets or funds that are

not held in the Trust Account (including any funds that have been released from the Trust Account upon completion of the Business Combination

and any assets that have been purchased or acquired with any such funds).

WITNESS WHEREOF, Maker, intending to be legally bound hereby, has caused this Note to be duly executed on the day and year first above