I recently bought a Babolat Pure Drive Cortex racquet (4 1/4 grip). Since I never owned a PDC previously I didn't think anything about the weight until yesterday when I played a match with an opponent that also had a PDC but grip size 4 3/8. After examining and comparing both of our racquets, I physically felt that the weight of his racquet was heavier than mine. His is stock with no lead and checking the printed specs on the racquet both should have weighed the same (300g). He had the original Babolat grip plus an overgrip on his racquet while I have a Prince replacement grip with Yonex OG. He also strung it with 16g Babolat PHT while I have a hybrid of MSV hex 1.10/OG Gosen 17g. Does the grip size increase, difference in string or difference in grips change a racquets weight so much that you can physically sense one racquet is heavier than another. I am pretty sure that the racquet I bought is the real deal, had a barcode underneath the orignal babalot grip and the holagram on the correct place. Thanks for you advice.