This coaster set of 4 features our Chicago Skyline design. Multi-functional little art pieces make great gifts, and are a great size (and price) for buyers. This design is perfect for Chicago tourists and city-goers alike. * Wispy clear glass, printed in black glass enamel * 4" square, with rubber bumpons on bottom * Dishwasher safe * Handmade in the USA Coasters are screen printed, fused glass. Glass is cut, and screen printed by hand with fine glass enamels, then fused overnight to 1415 degrees in a kiln. Each piece is made by artist Laurie Freivogel in her Oak Park studio. This design is part of a series and has other matching housewares!