Our chalkboard mugs can be written on with any color chalk and can provide hours of fun for children and adults alike! Bring out the artist in anyone with this unique art project! Customize your mug in a whole new way! Microwave safe! We can imprint your logo in whatever size your client desires! 2 3/4 x 3 1/2 inch. Available colors includes black, blue, yellow, white. Chalks not included.