Save money when shooting the MR31 target with these repair centers. Each MR-31C – Center Repair for the 100 Yard Reduction of 600 Yard MR-31 Target measures 10.5″ x 10.5″ and repairs the MR31 target center. The MR31 Target measures 21 x 24 inches and is the 100 yard reduction of the 200 yard military target. This is the official NRA target produced under license from the NRA on heavy weight tag board – not thin paper. MR3 targets sold under a separate listing.