3/16″ (4.5mm) Black Glossy 12″ x 12″ (Nominal Size) CAST Acrylic Plexiglass Sheet 0.177″ Thick AZM. Material: acrylic. Acrylic is half the weight and 17x stronger than glass. Unit Count: 1 Count. Actual thickness is 0.177″, all acrylic has a thickness tolerance.