The coffee mug is made of food-grade 18/8 stainless steel, liner of coffee mug will not produce any taste and will not rust, hand wash is recommended. The structure of the coffee mug body is sturdy, could be used for a long period of time. 12oz mug is lightweight and easy to carry, the surface of it is matte powder coating, this sweat-free design make coffee mug easy to grip, gently fits into your hand. coffee mug handle is long and wide, it is fit your fingers to grasp.