I truly don't understand people and their reviews. It's a tamper. It's nominally 53mm. It's got a rounded wood handle that is comfortable in the hand - it is bottom-heavy (gosh, ? it's supposed to be). What "balance" could you have on a tamper? Is it too big or too small for your hand? Does it give you splinters? Does it mysteriously turn green like a carnival diamond ring? These are relatively meaningful questions.It's a tamper, not a cardiac stent. It fits well in a Breville 54mm portafilter and OEM basket (if anyone asks).Honestly, I have no idea about "durability" but I assume, someone, somewhere could damage it.Look at the picture - it must tamp OK, it made a puck with 6month old pre-ground espresso coffee on the very first try.Buy one. If you don't like it, buy something else.