Save money when shooting the SR21 target with these repair centers. Each SR-21C – Center Repair for the 100 Yard Reduction of 300 Yard SR21 Target center measures 10.5″ x 10.5″ and repairs the SR21 target center. This is the official NRA target produced under license from the NRA on heavy weight tag board – not thin paper. SR21 targets sold under a separate listing. Sold in packs of 50 and 100.