Snap-on dead blow hammers are the best you can get. The ball peen is great because it doesn't bounce in a steel to steel blow. There's steel shot in the head and not lead like the others because the lead shot eventually becomes a solid blob and won't transfer from one side of the head cylinder to the other when you swing it. You also won't feel the hit and can use it all day because the head is attached to the steel rod handle with a polymer joint that acts like the the shaft of a golf club and flexes to increase the power of each blow. The handle is also cushioned for a great grip and also absorbs the blow shocks. And best of all it's warranted for life, as long as you own it. Not like other companies that will pre-set the expected life span of their product like 5 years or 7 years.You also don't need your original receipt.