Spiral Groove Acoustic Inside The patented spiral shape inside can greatly increase the resolution for high frequencies and decrease the diffuse reflection. The vocal and high frequency are elevated to a better level. The great seal in the ear canal ensures lossless music to reverberate in your ear Compatible for 4.5mm-6.5mm Earphones  Designed with 3 different sizes to meet different needs. It can be used as the best replacement for earphones with 4.5mm-6.5mm tube. . Easy to Clean and Durable  The foam eartips are easy to clean and longlasting as it adopts the imported high quality environmentally- friendly anti-allergic material Ergonomics for Supreme Experience  The eartips are adopting a slow-rebound design. It can fit in your ear perfectly and decrease the noise. You can enjoy the pure music anytime anywhere Integrated Foam and Tube. The eartips are made in a unibody material to make sure the foam and tube are seamlessly jointed. With this, it’s not easy to fall off after times of use, more durable than usual products