Currently he uses the Wilson ProStaff 97 with a paint job which makes it look like Burn FST 95, having switched from Wilson Hyper ProStaff 6.1 Midplus Stretch that he used early in his career. To go with that, del Potro uses the Luxilon ALU Power and Wilson Natural Gut strings in the mains and crosses respectively.
Secondly, how heavy is Del Potro racquet?
Although it can be quite heavy for some players (332 grams unstrung), it truly deserves its legendary racquet status as a trusted weapon for advanced players who like stability and control.