Nebula Coasters, Set of 4Details Protect any surface from a beverage with these artful objects. We've mixed and matched to make the perfect set. Each coaster is hand built using porcelain clay, then dipped in glaze and fired to Cone 6. Due to the handmade construction process and materials, slight variations that enhance the piece's character should be expected. Construction and Dimensions 4W x 4H Set comes with one of each color Porcelain Microwave and dishwasher safe