These earbuds hold its shape well and fits most stethoscope brand. If the old earbuds are damaged heavily, the sound conduction may be hindered and you will be unable to hear the sound clearly. It is hard to give the right diagnosis without knowing the real state and wearing worn out earbuds may hurt ear canal and even cause hearing loss. Features -Color: Random color. -Material: PVC. -Size: 1.6 x 1 x 1 cm/0.63 x 0.39 x 0.39 inch. -We provide you with 10 pairs of replacement ear tips for stethoscopes, a variety of colors included, sufficient for daily usage. -The ear tips are made of premium PVC material, which are safe for people to use. -These earplugs are just suitable for stethoscopes with metal parts. -Can keep your ears away from the cold metal, especially in winter. -Can reduce the vibration, isolate the interference from external noise, practical and helpful when using stethoscopes. Packing list: 10 Pairs x Ear Tips