Keep your coffee or tea warm while you work with this USB cup warmer coaster. Available in assorted colors, this 4″ x 4″ x 0.75″ lightweight iron and aluminum coaster is suitable for most stainless steel cups, baby bottles, ceramic cups, glasses, and more. The compact, easy-to-carry coaster can be directly plugged into a USB port for power. Add a brand name, logo or message to customize. Orders of 2,000 pieces or greater are eligible for sea shipping. Minimum order quantity is 50 pieces.