AZLA SednaEarfit Crystal for AirPods Pro Made of ultra-pure liquid silicone, also used in medical applications. These replacement eartips provide a higher level of adhesion, enhance noise-canceling functionality, and deliver crystal-clear sound quality. - Model: SednaEarfit Crystal for AirPods Pro - Sizes: S MS M - Material: Ultra-pure liquid silicone - Features: Crystal clear sound, double structure I have been using the MS size. The S and M sizes are unused. Thank you for looking.