ST1 Fine works on most sculpting materials and is good for blending edges of prosthetic sculptures. this is not a digging tool, rough treatment will shorten the life of your tool. Each tool is double ended with a 5" handle for comfort. (2 flat, 2 round, 2 slant, 2 point, 1 large and one small of each). Each tool is crimped and double checked for a tight fit.