The heads of these hammers are partially filled with steel shot to increase impact and reduce rebound. The one-piece threaded faces on these superb nylon face hammers feature a shoulder to absorb the force of side blows, protecting the threads.The one-piece aluminium head is serrated which keeps the faces tight. Also features a top quality hardwood handle and is supplied with 2 replaceable white nylon faces. Vaughan products are proven to be of superb quality and at a fraction of the price you would pay for some inferior products.