Qurly's Magic Color Changing Morning Hot Coffee or Tea Mug - Ceramic Heat Sensitive Cup (12 Ounce) Materials: High-quality porcelain. 12 ounce capacity. Water temperature should be over 70C/158F,the eye will wake up with a smile. The surface painting of the mug is made of organic matter. Mug paintings sustain well with hand wash. No microwave. No high temperature. No direct sun exposure. No high heat of dishwasher. Do not scratch the mug with metals or hard substance Safe to use it daily and environmentally friendly. Non-toxic and lead free and chrome-free. Meets all FDA standards. Slowly add hot water/hot milk/hot chocolate/coffee/tea/ to the mug, you will see a sleepy eye turning awake! Perfect for gift for your family and friends.