325 Piece Common Red Brick by Andi Mini Brick & Stone. 325 count bag of red bricks. This product is very versatile. It is made out of a high density casting plaster and is a solid color throughout. It can be easily trimmed to fit with a knife or scissors. Each package covers 50 square inches. Each brick measures: 5/8 in long x 1/4 in wide x 3/8 in deep.