All MKM rollers are carved from recycled wood from the furniture industry and then treated with tung oil. Each stamp is designed and carved to release perfectly from clay. Use MKM rollers to create beautiful designs and textures on any clay project. With your hand, roll MKM Big Hand Rollers on soft leather hard clay to make a continuous pattern. Images provided by MKM Pottery Tools. 4.7" x 1" diameter.