Save money when shooting the MR31 target with these repair centers. Each center 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.