Kordon Oasis (Novalek) SOA80304 Bell Bottle and Hold Guard Small Animal Value Set, 4-Ounce, Variety Colors Value set consists a rigid plastic bell bottle and basic Hold-Guard designed specifically to fit the bottle accurately and safely Suitable for small animals like mice, rats, gerbils, hamsters and hedgehogs Rounded bottle top discourages chewing and protects water bottle from chewing damage Adjustable strap hangs over top edges of most wire cages and aquariums Available in 4-ounce size