ZON38-725 Berna Assembler Set, Hobby Clamps Berna Hobby Clamps are unique clamps for holding relatively small and/or delicate items and even round or unusually shaped items. They are made of space-age materials, and consist of a high density carbon fiber beam, two polycarbonate jaws, two flexible, heat resistant silicone rubber buffers, and two silicone rubber stops. The Assortment Pack includes: 2 large clamps with 8 inch beams (37-720) 1 small clamp with a 3 inch beam (38-710) It also contains a connector strip for extending the capacity of the beams for clamping larger pieces.