It may be the desert but if you love Joshua Tree you know it can get super cold! Stay warm with a hot cup of coffee or tea and reminisce about the magical rocks and other worldly trees! The perfect gift for a Joshua Tree lover in your life! It’s microwave and dishwasher safe and made of black, durable ceramic in 11-ounce sizes. .: Black ceramic .: 11 oz (0.33 l) .: C-handle .: Note: black design elements on black mug may differ in tones. Use transparent background.