This is a new hammer for many Roland keyboards and digital pianos manufactured before the year 2000 RD500 RD600 KR375 KR575 KR770 KR370 KR570 KR4300 HP145 HP147 HP236 HP237 HP245 HP330 HP335 HP530 HP535 HP550 HP555 HP5700 HP730 HP7700
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