6-oz. capacity; borosilicate glass; dual-wall design; dishwasher safe; 2-pack

Ember Mug Charging Coaster 2 ensures your Ember stays charged for all day use and multiple cups of coffee. Additional charging coasters are great to have in multiple rooms throughout your home or office, so your Ember is always ready when you are. It can be used while liquid is inside of your Ember Mug to maintain charge, and can also be used as a convenient place to store your Ember Mug when not in use.