GUEE b-Copper is a copper-made bicycle thumb bell that will warn people of your whereabouts. It is able to clip to brake/ gear cable/gloves and any other cockpit based accessories or components. Aluminium machined clamp with a tool-free mounting system, also fit for both right and left-handed users. Ultralight (weighing only at 19g) but still very loud! Features Compact and light only at 19g. Copper material for a loud chime. Aluminium clip bracket. Universal design, fit for both left & right-hand side use.