1、Scope Of Application: Suitable for most muscle massager. The outer diameter of the massage head is about 19mm / 0.75in, suitable for muscle massager with inner diameter of about 18.5mm / 0.73in. 2、Soreness Relief: Match with muscle massager, using scientific vibration frequency and amplitude, it can activate muscles, increase blood flow, greatly reduce muscle recovery time, reduce soreness. 3、Massage Head Set: Multiple types of replaceable massage head, suitable for different parts and muscle groups, can be replaced according to needs, practical. 4、EVA Material: Massage head adopts excellent EVA material, has great shock absorption effect. Safe and odorless, can be in direct contact with the skin, easy to clean. 5、Portable Design: Light weight and compact, easy to install on the deep tissue massager, convenient to store and carry, perfect for home and massage shop. Item Type: Muscle Massager Head Material: EVA Quantity: 6pcs (large ball head, small ball head, black curved head, T shaped head, U shaped head, projectile head) Caliber: Approx. 19mm / 0.7in Applicable parts of each massage head: Ball head: suitable for large muscles such as buttocks, thighs, calves, etc., to relax soft tissues and sensitive muscle groups. U shaped head: used for the spine, the head and the Achilles tendon. T shaped head: massage the large flat muscles of the lower back, relax the yourself, and shape every muscle. Projectile head: impact deep tissues, such as meridians, acupuncture points, etc. Deep relaxation, shape every muscle in your body. Curved head: suitable for neck and calf 1 x Large Ball Head 1 x Small Ball Head 1 x Black Curved Head 1 x T Shaped Head 1 x U Shaped Head 1 x Projectile Head