Black Replacement Eartips; Comfort Ear Tips Earbuds Eargels for Sennheiser CX300, CX400, CX55 Set includes 6 replacelement eartips in total; 1 Pair in Large, 1 Pair in Medium and 1 Pair in Small Sizes Easy to Install. Maximize the noise reduction Snug, Stay-In-Ear fit Soft, comfortable yet durable and long lasting