Shure PA910M Replacement Black Foam Sleeves (Medium) for Shure SE210, SE310, SE420, SE530 and SE530PTH Earphones Replacement foam sleeves for SE210, SE310, SE420, SE530 and SE530PTH earphones Compress to fit gently into the ear, then expand to form a tight yet comfortable seal Tapered design for a better fit Medium size Its a 5-pair