Strong construction made of lightweight ABS polymer. The Polygurad advantages are that Polyguard vaults are 3 times stronger than steel by weight, and far more tensile strength than concrete vaults. Tensile strength is defined as a process to measure the greatest longitudinal stress a substance can bear without tearing apart, being pulled apart or stretched before breaking. It is stress measured as force per unit area. Pounds per square inch. Polymer is used where exceptional strength is needed for above-average temperature or moisture levels exist. It has high corrosive resistance, superior dimensional stability and highly resistance to organic solvents, and long term stability. Polyguard is a lightweight material. This new vault comes in white or Oxford Grey. Polymers by nature, are non-biodegradable, non-porous and unaffected by minerals found in the soil. These polymers are commonly used in underground water and sewer lines and conduits, due to their durable nature and exceptional strength. Polyguard vaults have extensive 100-year warranties that provide the maximum FTC allowable assurance for families. Polyguard burial vaults colors are molded with the polymer and not painted on. This eliminates the potential for flaking paint. Polyguard vaults offer a double sea. A mastic sealant for a permanent sea is included. This offers ultimate protection while preserving cemetery aesthetics Tier 1Inside. 8.5"H X 105" W X 105" L Outside dimensions: 12.75" H" x 14 Wx 14" Teir 2 Inside measures: 11.0"H x 9.25" W x 9.25"L ******** Outside dimensions are the same for all 3 tiers Tier 2 outside measures::12.75"" H x14""W x 14""L Tier 3 Inside measures: Tier 3 measures: 12"H x7.0" W x 7.0" L The picture shown is for Tier 1 size. Tier 2, and Tier 3. To see what the Mastic seal method looks like go to the Heartfelt Casket/Vault Combination and view the picture there. This vault weighs 6 pounds. We have included a picture of the top of the vault to show you the different tiers (sizes) within the same vault. Contact Lovedonesurns for assistance when placing an order for this vault and we will be glad to assist and answer all questions you may have. We are here for you. With one vault you can fit 3 different sizes (Tiers). You may be able to use this for a baby or young child size urn.