These are larger blocks are designed for use in retaining walls, bridge piers, etc. Each block physical measures 1 inch by 1/2 inch - 4 feet by 2 feet in O scale (1:43). Includes 4 textured plastic sheets 8"x4". You can also combine more sheets from other auctions to cover an even larger area - they are designed to be seamless when placed end to end and top to bottom.