product content [Black Round] STRONGER WATERPROOF LAYER The upgraded felt coasters are added additional waterproof layer, which can absorb a lot of condensed water and block the water directly penetrate to the tables' surface Keep your desk dry to protect your desk FAST ABSORPTION Choose fast-absorbing European premium felt, which can absorb condensation within 1 second, the absorption is faster than any other coasters The felt coasters can better protect your table from the perils of both hot and cold beverages as insulation coasters NON-STICK BOTTOM The bottom non-slip layer can be firmly adhered to the desktop, so the drink coaster will never stick to the bottom of the cup PROPER SIZE Coaster size 4 3 inch, suitable for all glasses, mugs, cups European felt coasters are easy to clean and dry quickly without mold They can also be washed in the dishwasher BEST GIFT IDEA Perfect housewarming present They contain a beautiful packaging, looks high-grade and decent The simple and exquisite felt coasters are perfect as gifts for best friends