I used 12 oz. Hammer "Wood is good" for many years. The head of this hammer still looks new after 15 years. More importantly, the "Wood is Good" urethane head on the hammer also keeps the handles of my expensive arrow woodcarving chisels looking like new. I always thought I should have bought a second Wood is Good hammer. in one of their heavier sizes for use with larger bits. I recently ordered 18oz. one and it's perfect when I need some extra "encouragement" with a wider chisel making harder cuts. 18 oz. a mallet the same size and shape as a 12 ounce mallet. but it looks like there is a heavy lead insert in the head adding weight. I plan to order a third Wood is Good hammer to use in the garage with my heavy duty carpenter's chisels. Great price and you won't regret your purchase.