Aritomi Handcuff Strap II, approximately 16cm long, made of PP material. This is just a toy, so please be careful as inserting fingers, etc., may cause it to tighten and become impossible to remove. I tried to open it with a key, but it didn't work well. To release it, push the lock all the way in and it will rotate around. Includes a bonus Pipo-kun mini light. Convenient for a little illumination at night. - Product Name: Handcuff Strap II - Character: Aritomi - Size: Approximately 16cm (total strap length) - Material: PP (polypropylene) - Notes: Usage precautions are listed Thank you for viewing.