Exceeded my expectations for durability. If you put a little more pressure on them, they won't hold their shape either, but that's fine with a brush with softer metal bristles. I've used them to polish stainless steel golf clubs and they didn't hurt, but gave a nice shine and could be pressed into the contour of the back of the cavity. Made the Ping copper iron brand new, no material removal or scratches, did things that a steel brush would damage. Durable and long lasting considering. The waves stay true and don't bend. In general very satisfied.
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