Available on back order Simple, classic, robust. One of the most popular rope-access backup devices ever. The Duck-R conforms to EN 12841 and unlike older products, works on a single rope and can be towed continuously for short descents after a function test. With a steel body and spring, it certainly outlasts many competitors, and the non-spike design means it's kind to ropes. Alloy cam is more kind to the rope in ordinary environments, getting you maximum value and life out of your ropes. Steel cam is tougher so it lasts longer in extremely abrasive conditions (e.g. cement dust, sand). Replacement steel and alloy cams are available anytime! Plus, if you already had one with the alloy cam, yes you can change it to a steel cam, OR the other way around. Specifications: CE 0120 / EN 12841 Type A Rope Diameter 10.5 - 11mm Rope Type: EN1891:1998 Type A Materials:Body: Stainless SteelCam: Aluminium or SteelSpring: Spring Stainless SteelCord: NylonCertifications:CE 0120, EN 12841:2006 AWeight: 260 grams (aluminium cam version) Colour: Body- natural steel silver with Red cam (aluminum cam version) All - Natural steel silver (steel cam version)