Ntsia hlau
Xov studs feem ntau crafted los ntawm ntau haiv neeg - cov ntaub ntawv zoo, xaiv raws li cov kev xav tau ntawm ntau daim ntawv thov hais txog lub zog, durability, thiab corrosion kuj. Cov pa roj carbon steel yog ib qho ntawm cov khoom siv dav tshaj plaws, tshwj xeeb tshaj yog nyob rau qib 4.8, 8.8, thiab 10.9.