Measurements:... Small: Outer Diameter:10mm... Height:7mm .. Medium: Outer Diameter:12mm... Height:8mm .. Large: Outer Diameter:14mm... Height:8mm .. Product Description: Ergonomic Replacement Set Earbuds Ear tips Water washable, anti-static, removable and replaceable. Perfect fit and comfort for your ears, left and right. Great replacement for any damaged, scratched or defective Earbuds Ear tips. You can also use these to provide better hygiene - when you change often. (In-Ear Earphones are not included!) Instructions to Install Ear tips: With one hand hold the ear tip and the other, the In-Ear Earphone Driver. Place the Driver of the Earphone in the edge of the ear tip canal. Apply pressure and with a circular motion, twist with one hand clockwise and with the other the opposite direction, until the ear tip has fully covered the Driver of the Earphone. Once you have put them on properly, they will stay on securely.