L size, 3 pairs [Compatibility] These are Fit in the Case polyurethane foam noise-canceling ear tips compatible with WF-1000XM4, WF-1000XM3, Linkbuds S, and WF-C500. [Comfortable Fit] The memory foam softens with body heat and gently conforms to your ear. Creates a comfortable listening experience. [Blocks Noise] Significantly eliminates external noise, allowing you to focus more on your music. [Secure Fit] The foam tips fit snugly in the ear canal, so they won't fall out even with vigorous movement. [Charge as is] Designed to fit in the charging case, allowing for charging without interference.