Both U-shaped and O-shaped microphones can be used. KTV high-end sponge microphone covers have excellent elasticity and contraction, thick and no cuts (micro-close), uniform dyeing, good breathability, and sound quality is guaranteed. The size of the microphone cover is about 7 cm long, the outer diameter is about 6 cm, the thickness is about 1 cm, and the inner diameter is about 3.7 cm.