Measurements:... Outer Diameter:10mm... Height:9mm .. Product Description:.. -These eartips isolate sound, provide secure fit, and maximize comfort of your in ear device. -Water washable, antistatic, removable and replaceable. -Perfect fit and comfort for your ears, left and right. -Perfect replacement for any damaged, scratched or defective Earbuds Eartips. -You can also use these to provide better hygiene - when you change often. 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. Also to help with installation, you can slightly moisten the rim of the ear tip canal, and repeat the process. Make sure you just moisten the ear tip, do not apply a lot of water, just a drop is enough, so you do not get the speaker driver wet.