Square ColorLyte® Glass Coaster, with White Opaque Sublimation Backing, 3.94" x 3.94" x .16". Tempered Textured Chinchilla Finish glass; excellent gift item. Dishwasher Safe, for maximum life of the imaged product, we recommend hand washing. Customize any kitchen with matching trivets, cutting boards and serving trays. Production of this glass item requires the use of a 1/8" thick green rubber pad or a 1/2" thick Nomex felt pad, both at least an inch larger than the board, sold separately.