Traditionally, the hammer handle is made of steel or wood. The handles of this hammer set are made of fiberglass and plastic on the outside. I don't see the fiberglass core but the plastic is very strong and strong. Both the cam and the rubber mallets are of high quality. It is more convenient to hold and hammer items than items with a wooden handle. I only use them for a short time. I don't know if this alternative material will last longer than wood.