Oasis Value-Sets include genuine Oasis All-Weather Water Bottles and Basic Hold-Guards paired for a perfect fit. All-Weather Bottles feature sturdy natural polyethylene construction with a silk-screened design. The Hold-Guard is sturdy metal with non-toxic powder coating. The guard hangs inside the pet's cage and protects water bottle and cap from chewing biting and gnawing damage. The easy to adjust hanger strap fits many sizes of aquarium-type pet environments (hangs over the upper edge) or wire cages (hanger straps slides through the wird side.) Suitable for fancy mice fancy rats gerbils hamsters sugar gliders and hedgehogs. 8 ounce All-Weather Bottle with matching Hold-Guard.