This is a replacement arm for the SwitchBot Bot (Smart Switch) if the original arm breaks. ★The SwitchBot Bot body shown in the photo is not included. ★This is a set of 3 black arms. ・This product is made using a 3D printer. Please assess the quality based on the photos. There is no test data for strength or durability. ・The material is PETG (glycol-modified polyethylene terephthalate) with a slightly subdued gloss. ・The photos with the SwitchBot Bot body show the product attached. ・You will need to disassemble the main unit to replace the arm. A Phillips head and a flathead precision screwdriver are recommended for disassembly.