Birchwood Casey Shoot-N-C 18 Inch Square Matrix Target is a result of request by many for much larger targets. Birchwood Casey developed a system to build your own target size. Use like floor tiles to build any size shotgun patterning or long range rifle shooting target. Matrix pasters come in 12.25 inch squares and 17.25 inch squares and are adhesive making it a breeze to build. The 18 Inch Square Matrix Targets are excellent for those with reduced vision capabilities. You can see Bullet holes instantly and the bright yellow ring appears around each hole upon impact. WOW! These targets are great for indoor or outdoor use and come in 12 targets per package.