Specifications:Size: product diameter 9mm pen diameter 7mm full length 178mm Product process:CNC piano paintMaterial: Aluminum Alloy Nano Silica GelCompatible use: Suitable for Android phones, Apple phones, ipad Pro and all brands of flat capacitive screen devices. Features:1. Smooth painting: imported conductive silica gel, soft materials, painting, writing, games and other use processes, without harming the screen; 2. More accurate positioning, without affecting line thickness;3. Super fit: applicable to all android and apple smart touch capacitive screen devices;4. easy to use: no need to charge, ready to use;5. Replaceable tip: it is easy to replace the tip of the pen.n devices;