Description: MASSAGER HEAD WITH 4 ROUND BALL: Massage head with 4 round ball. Which increase the massage area, to feel more comfortable.UPGRADED 4 BALLS MASSAGER HEAD: Increase the massage area and enhance the using effect. Quite suitable for cervical vertebra,lumbar vertebra,abdomen,instep.EASY TO USE:Insert the massage head into the adapter, then insert into the massage. UNIVERSAL FIT: Our massage head can be fitted onto any fascia It's for the mainstream interface sizes of 12-19mm on the market, making it a versatile addition to your massage equipment.PACKAGE INCLUDES: Each package comes with a massage replacement head bracket and three interfaces. Specification: Material: PP Size Chart: Width: 8cm/3.15inchThree Interfaces Size: 12-19mm1.2cm-1.9cm/0.47inch-0.75inch Package Includes: 1Massager Head with 4 Round Ball3 Interface Note: Please allow slightly errors 1-2cm differences due to manual measurement.