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Double beams are some of the most commonly used parts when building projects. Our beams are made from high strength aluminum and anodised to protect them from corrosion. Not only are you getting the beams with our kit, you get all required parts to build many different configurations. It even comes with an allen key for your convenience. CCompatible with all OSEPP Mechanical Kits, LEGO Technic parts and MakeBlock details:https://osepp.com/mechanical-parts/128-double-beam-09-kit