Wow, a lot has changed since 2018 and since this comment was posted, So the Long term truth is I have some folks still using the first sledgehammer they purchased. We still make them with the same material, The Dura-Tek blend has become the Over Achiever we have 7 different durometers in 5" and 8" inch blades along with 4 different channel blades in 3mmx19mm . https://www.gasketprotools.com/blades