3.93 inch size suits all cups and mugs, making them excellent bar tools and accessories. Made of FDA approved silicone. With unique design, they will never leave any tea or coffee stain mark on your wood tabletop, side table or bedstand. Your logos are welcome. Measuring 3.93 inches, this custom heat-insulating non-slip silicone coaster. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. We offer logo printing and full packaging customization. Product Highlights: Portable, durable, practical for daily use.