Cremains Urn Vault (small) This urn vault is made from high impact polystyrene. Polystyrene resins and styrene copolymers is a synthetic aromatic polymer that can be rigid, foamed or an integral part of a copolymer. Copolymers include systems such as high impact polystyrene (HIPS) and acrylonitrile butadiene styrene (ABS), which have wide use due to their impact resistance. This material is very easily moldable. This vault weighs only 3 pounds. It is meant for the baby of a small pet. The outside dimensions are: 6.5"H x 10.5" W x 13" L. Inside Narrow dimensions are: 6.5"H x 8.0" W x 9.75"L. Inside Wide dimensions are: 3.25"H x 8.5"W x 10.5"L. This size vault is especially a good size for burial of the temporary urn that first comes from the crematory or the funeral home used for the cremation. This could also be used for the TSA approved silk travel, temporary urn as well. That means that if a pet is cremated and is 200 pounds or under it could fit into this vault. Please call Lovedonesurns.com at 1-877-236-7615 for assistance before ordering this vault for proper sizing.