Tus kws kho mob cov hniav muaj qhov toughness heev thiab super abrasion tsis kam, du thiab ncaj ntug, kev ua tau zoo hauv cov kua nplaum scraping, thiab cov khoom siv zoo heev, uas tuaj yeem ua kom zoo rau kev kub ceev thiab siv sij hawm ntev. Thaum siv, nws tuaj yeem ua kom muaj kev sib cuag zoo nrog lub ntsej muag ntawm cov ntawv luam ntawv yam tsis muaj xuab zeb kom ua tiav cov txiaj ntsig zoo tshaj plaws.