Description:OOTDTY  Long wear life and smooth.Easy to replace ,Scratch-resistant.Can greatly reduce the friction between screen and pen tip to protect the screen.So that you can use it on your tablet for browsing, writing, drawing.Simply hold the replaced pen tip,pull it out easily insert the new tip into and use.Specifications:Product name:Stylus pen tipColor:BlackMaterial:Carbon Polyacetalsurface pro 4 Size:About 12 x 1.7mmSurface Pro 3 Size : Length :1.7cm(0.67in) Package Included:3 Pcs/set x Replacement magnetic stylus pen tip Note:Transition: 1cm=10mm=0.39inchPlease allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!