1、Applicability: Designed to be compatible with more than 98% of the earphones on the market. Wide opening with industry standard, suitable for earphones tips from 4.3mm to 6.0mm. (most earphones) 2、Memory Foam Material: Replacement earplugs made of slow rebound memory foam material can provide more noise isolation, ear stability and lasting comfort, durable, flexible, replaceable and detachable. 3、Replacement Eartips: Earplug replacement tips for any damaged, scratched, defective or missing earplugs, give a new life to your headphones. Long lasting and not easy to break. 4、Fit For Your Ear Canal: The super soft memory foam can change with the ear canal, perfectly fit any type of ear canal, and is very suitable for fixing the earphones to prevent them from falling during exercise. 5、Multiple Sizes: 3 pairs of replacement earplugs, 3 sizes, 1 pair of earplugs for each size. (L/M/S each pair) Multiple core sizes allow you to find the perfect fit for your earphones.