Wood, steel wire dia. 0.35 mm.
Return tools for warranty replacement directly to KC Tool. All returns are subject to inspection prior to replacement.
The wooden handle is a must if you do not want to damage the surroundings when cleaning the break calipers for example. I haven't used it yet but I'm sure it'll last for long.
Worth every penny. I use this for knocking rust off brake components and other various rust cleaning jobs. Way, way, WAY better then other brushes you can buy for the price. The handle is smooth and splinter free. The bristles are stiff and don't fall out as you use the brush; no matter how aggressive you get.