1 bag contains 325 pieces and covers approximately 60 +/- square inches. Each brick is approximatey 3/8 wide x 5/8" long x 1/8" thick. These plaster bricks have a flat back for easy installation and since they are plaster, they are easy to cut with an exacto knife or shape with sandpaper. We recommend gluing these down with a white glue first. Dry. Then spray them with a matte finish sealer. Dry. Then grout in between with mortar...we use Magic Stucco. Dry. Spray again with matte finish sealer."