What is this?Antenna Rubber Group Ring for H-777 RT22 RT21 RT27 RB15 RB18 RT35 RT17 RT18 RT19 RT28 H-777S walkie-talkies, Rubber Ring. What will I get?Color: GreenMaterial: RubberOutside Diameter: 15mm/0.59 inchInner Diameter: 12mm/0.47 inchIn the package of: 2pcs x Antenna Rubber Ring Are there any advantages of the product?There are 6 colors of rubber rings. Each color makes your walkie-talkie more personalized.Soft color bands material is more convenient and flexible when wearing a rubber ring on the walkie-talkie.The prominent color of the antenna circle makes your walkie-talkie stand out among the numerous walkie-talkies.How to use it?The outer diameter of the antenna that the antenna ring can fit in is in the range of 0.52-1.19inch.What should I notice?There may be a slight color difference between the real object and the picture.