Yunt Anti-Lost Pet Dog Cat Puppy ID Address Name Label Tag Barrel Tube Collars Leash Size(L x Bottom Dia.): 2.5 x 1cm(0.98 x 0.39inch); This tube contains your important emergency information; Bottom of tube unscrews and holds information sheet; Place it on pets collar and never worry about them being lost again; All your contact information can be kept inside letting others know how to reach you.