Packing includes: 3 Pairs-Larger; MATERIAL: Soft and comfortable Silicon. Made of a durable, long lasting, hypoallergenic, medical grade polymer. COMPATIBILITY: Replacement Earmould Earbuds for use with most Coil Tube Audio Kits, either Left or Right Ear. Work for transparent acoutic tube type earphone, such as our TC-807-1, TC-801,TC-617-1,TC-617-1N, P11A0 Earpiece etc. Replacement your Mushroom Ear Tips / Round Ear Bud to choose a different HYS size Earmold to make sure it stays in place and be comfortable especially if your work for long hours.