Kaimao Round Silicone Coaster Cup Coffee Drinks Mat Heat Resistant and Non-slip with Lip without any Leakage 10 x0.5cm---Black The coaster is made of flexible silicone which is non-slip Diameter:10cm; Thickness: 0.5cm A lip around the edge prevents any leakage onto your furniture They are easy to clean by hand or using the dishwasher Protecting your hot drinks and tea pot from causing heat damage to your table