These hammer weights are used and contain some small stress fractures in the plastic from regular use but should be good for quite a bit more use and at this price you should probably buy a few extras because they have gotten so hard to find. I applied reasonable finger pressure trying to break them and discarded any that broke. These hammers will also fit the models shown below.
Roland A-90 EX
Roland RD-500 (type 2)
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Fast shipping, hammers are used but work just fine. Thanks!