【2020 New Version】Durable tungsten carbide tip, Comparable to the hardness of diamonds. Works effortlessly on hard materials including hardened steel, stainless steel, ceramics and glass. One-time briquetting tungsten carbide tip is more durable than others, not easy to drop. | 【No Magnet No annoying】Some tungsten carbide scriber is design with a magnet head on it, But most of these situation is that they works very annoying and useless mostly. Because the magnet likes to pick everything up with it. | 【4=8 Double head design】So we add another Tungsten carbide to another side and that mean you get 8 tungsten scribers and no need exchange the tip and this also mean this kind of scriber have a more durable tip. | 【Hardness comparable to diamond】This scriber's mohs high up 9.5 comparable diamond. It can be said that apart from diamonds, it can leave clear marks on any material. The service life is also extremely good. | 【Warranty】Not satisfied with a full refund within one month and 18 month free replacement.