The APS Paderno World Cuisine 25cm square natural slate trays is black in colour and creates a unique and impressive presentation for a variety of dishes from sushi to appetisers. The natural slate retains cool temperatures extremely efficiently. Each tray is sealed with clear varnish. They are food safe, waterproof, as well as oil and liquid repellent. Note that they are not dishwasher safe. Each slate tray has skid-resistant felt pads on the underside.