I attached this to a helmet after purchasing it new, but I removed it without using it and have kept it stored at home. It can be removed with the three adjustable snap buttons on the top, so it can be attached to most helmets. (It can be attached to jet, full-face, and half helmets) 【Brand】Arai 【SIZE】Width: Approximately 19cm / Depth: Approximately 10cm The buttons on both sides can be adjusted by sliding (center fixed). Please understand that there may be some oversight regarding the condition, as this is a personal inspection. Please refrain from purchasing if you are sensitive to details or seek perfection. Thank you.