Hammers with fibreglass handle

Fibreglass

— usually, in this case, not pure fibreglass is meant, but fibreglass (fibreglass) — a material made of thin glass filaments and a binding plastic. This combination allows you to achieve very high strength (in some grades — comparable to steel) with low weight and affordable cost. Due to this, fibreglass handles are very widely used in modern hammers, only slightly inferior in popularity to wooden ones.