Material: Stainless Steel, Plastic Size: 1200 x 12mm (L x Dia) It can be used as bicycle tail light, backpack light, helmet light. Features This lock is preset to operate at 00000.To set your own combination,follow the steps below; 1.Dial the combination wheels to 00000 and withdraw the cable. 2.Turn the knob 90 degrees clockwise to the designated position 3.Reset the combination wheels to the desired combination,making sure the numbers are lined up with the pointer. 4.Have selecting your combination numbers,turn the knob back to the original postition in a counterclockwise direction. 5.The new combination is now set. 6.Repeat the 1-5 steps above to reset the combination anytime you like. Notes 1. Please allow slight measuring deviation due to manual measurement. 2. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures.