Aisster 6Pcs Permanent Car Motorcycle Tyre Tread Rubber Paint Marker Pen Length: about 145mm / 5.7 " Fast dry after writing Oil-based ink, writing smooth, waterproof, does not fade. This permanent paint marker Can be written on any surface: metal, glass, wood, plastic, painted surfaces, etc. All Pen's tip are yellow before use.You need press the the tip down 3 or 4 times,it will become corresponding color