Unlike regular sandpaper which is prone to wrinkling and tearing, the cushioned sponge backing of Infini Model's Softback Polishing Sticks is designed to follow the contours of your project beautifully, resulting in a finer finish in less time. Each stick is double-sided for twice the life, with a semi-flexible plastic backbone in the middle for a firm grip and added pressure when working in confined areas. Set of eight 5-1/4" x 3/4" x 1/8" thick sticks includes one each 400, 600, 800, 1000, 2000, 3000, 5000 and 7000 grit. Use wet or dry. Package Dimensions: 6.61 L x 3.23 W x 0.31 H inches