This Agreement constitutes the entire agreement between the parties with respect to the subject matter hereof and supersedes and cancels all prior or contemporaneous oral or written agreements and understandings with respect to the subject matter hereof. All exhibits to this Agreement are hereby incorporated herein by reference. No purchase order delivered by Buyer under this Agreement shall modify or supplement the terms and provisions of this Agreement, the parties acknowledging and agreeing that any different or supplemental terms contained therein are contained therein solely for the convenience of Buyer so that Buyer may use its standard purchase orders and shall have no effect whatsoever on this Agreement and shall be treated as if they do not exist. This Agreement may not be changed or modified orally or by any such purchase order, but only by an instrument in writing signed by the parties hereto which instrument unequivocally states that it is an amendment to this Agreement.