We offer 8mm (05B) plastic and metal chain. Building with an 8mm chain in combination with our 8mm pattern / grid makes it extremely easy to figure out the number of links needed to join sprockets of similar size. The plastic offers the ability to reconfigure without any tools, while still offering an extraordinary tensile strength of 50kg. If you have built it and let it get closer or just want the more powerful option, we offer a metal chain with a working load of 125+ kg!