Made of 8.2"L x 2.7"W Metal and Plastic. For professional or home use, our extendable massage rollers will help relieve the sore muscles and reduce muscular imbalances. Fitness programs, yoga studios, and massage centers can order these extendable massage roller balls to promote their business. Manufactured from plastic and metal, this device can be personalized with your brand logos in red, blue, and green product colors.