ak interactive medium hard tip silicone brushesSilicone tip brushes. Two hardnesses and two sizes. The perfect tool when undertaking any modeling job. Also suitable for applying oil glazes on flat vehicle surfaces. The white tipped ones are normal hardness and the black tipped ones are slightly higher hard. Suitable for any modeling putty, Apoxie Sculpt, Greenpower, Milliput, Sculpey, Fimo, etc. Use water, alcohol or vaseline as a softening agent to prevent the putty from sticking to the tip of