Wowos Leopard Light Emitting Collar Dogs Material: Nylon Dog's best gift!Are you still worry about stray dogs? That night the dog still can not find the dog position? S: range 11.8-15.7inchs, less than 11.8inchs can cut DIY M: the adjustment range of 15-19.5inchs, less than 19.5 of the DIY can be cut L: range of 18.5-23.5inchs, less than 23.5inchs can cut DIY