【Effortless Stirring】 This self-stirring coffee mug does all the work for you, without any spoons or stirrers. This mug is your best friend for effortless and speedy stirring. 【High-Quality Materials】 Mixing mug made of high borosilicate glass and high-quality wood imitation plastic, easy to deal with changes in cold and heat, no bursting in sudden cooling and sudden heating, low-temperature resistance -30°, high temperature resistance 150°.