This 8 piece set of flexible contour sanding grips makes short work of sanding both concave and convex shapes without distortion of the profile. Just wrap sandpaper around the profile and start sanding. The set contains: 3 flexible foam contour pads each 5-1/2 inches x 2-3/4 inches in 3 thicknesses (7/16, 7/32 and 5/32), 4 convex contours (9/16, 7/16, 5/16 and 1/8) and one concave profile (1 inch). Contour pads have micro edge profiles on opposite end for flat, radius and knife edge profiles. Contours are made from flexible yet firm rubber to conform to variations in profiles. Rubber material grabs sandpaper and prevents it from slipping.