Acrylic with fiberglass reinforcement material for strength and durability.Available in 36"x36", 39"x39", 42"x42" and 47"x47" Thermal and shock resistant Double threshold. Non-porous surface makes cleaning and faster and more effective. Textured bottom that meets ASTM requirements for safer showering.Strainer not included. Limited lifetime warranty. Fits Models: VG6326-CH, VG6326-BN, VG6326-PB, VG6316-CH, VG6318-BN, VG6318-PB, VG6426-CH