These are great for helping with slipping tuning. They will not eliminate it fully, but they certainly do reduce the amount of slippage with the tension rods. For the price, they're a cheap and effective upgrade to the lugs that come with most drum kits (which are just stock washers anyway which don't do much else) so it is well worth having a few packets to put all round the kit for all heavy hitters. Definitely recommended for any drummer though, every little helps when it comes to tuning reliability!
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