Laundry balls: material: durable plastic. diameter: about 1.9-inch /4.8cm. Dryer ball: soften fabrics, help fabrics dry faster. Laundry dryer balls: creative items to make a safe, easy and effective washing. can protect your clothes from being twisted or tangled together. Washing ball: 4 pieces of the lanudry balls dryer balls in one set will be sold together by random color. Reusable dryer balls: how it works: simply place clothes and washing balls into washing machine, the nodules will massage fabrics to naturally fluff up and soften.