The Stargate Coaster Set comes with four mini stargates, each measuring 4.57" (11.6cm) across. The stargate design is screen accurate and was taken from the CGI files used to create the visual effects for Stargate SG-1. Each glyph and chevron is perfectly reproduced, hand cast in resin and hand painted in detail with weathering. The event horizon is semi-transparent blue with a rippled surface, just like the big 'gates. Stargate Coasters are hand-painted sculptures and are not dishwasher safe. When necessary, please clean with a damp, clean cloth.