The ones I am using at the moment are called a Bass Drum Patch by Evans.They are stick on nylon and oval to fit my double beaters.When I used to use my single Speed King beater,I had a round thick plastic one but I cant remember the name.They are to keep the beater from wearing down the Bass head.I dont think they are a necessity,but extending the life of your Bass head means not buying another one as soon.
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