MyLifeUNIT Stainless Steel Insulated Cups Coffee Cups, Double Layer Heat Insulation, Set of 6 Material: stainless steel. Note: The handle is made of painted plastic for the consideration of heat conduction. Extremely durable, light, unbreakable and durable stainless steel construction, recyclable and dishwasher safe. Perfect at home at the dining table, picnics, outdoor events, the workplace, schools, camping, and hiking. Great as a replacement to plastic drinking cups. Double Insulated, Stackable, transportable and perfect for travel, events and other outdoor activities. Size: 3" x 2.3" x 3.7/8 x 6 x 9.5cm.