The PCR30 has a total of 32 keys but I have just checked my spare parts and there are only 23 keys left, details of which keys are available is listed below.
ROLAND Edirol PCR30 Midi Controller Key SPARE PARTEach key is supplied with the correct spring (black keys use a different spring to the white keys)Keys available:

BLACK KEY (with spring): 10

Please refer to the photograph to see which white key (numbers 1 ~ 5) I am referring to here …
WHITE KEY (with spring) #1: 2
WHITE KEY (with spring) #2: 2
WHITE KEY (with spring) #3: 2
WHITE KEY (with spring) #4: 3
WHITE KEY (with spring) #5: 4

All are USED but in excellent conditionI am offering per key, it is important to look at the photograph to identify which white key you need (numbered 1 ~ 5 in the photograph)The black keys are all the same so there is no need to choose the typeParted out from an Edirol PCR30 keyboard where the rubber membrane had failed and these MAY suit other midi controllers
The above list of keys is ALL that I have left nowAll keys are clean, unmarked and not discoloured