Ader Sporting Goods Foam Roller 16" x4"x 40mm ID Sold By Pair Ader rubber foam roller (foam pad) for exercise equipment. Bench's leg curl, leg extension, pec dec (butterfly) replacement parts. Size: 16"x4" OD x 40mm ID Sold as a pair (2 pieces) Save 5% each on foam roller offered by fitness-outlet when you purchase 3 or more sets.