Plastic Designed to take wrinkles out of clothes during drying process Save money over single-use dryer sheets with multi-use dryer balls Specially designed to get your clothes dried faster Dimensions: 2.7 x 2.7 x .27 easy to use / drop it right in the dryer chemical & allergy free / for the sensitive side in you energy efficiency / saves energy and money cuts drying time / for the person on the go Increases drying time by lifting and separating fabrics