Casio SP-3 Sustain Pedal for CTK, WK
Casio SP-3 Sustain Pedal
Use with models CTK-495, CTK-531, CTK-541, CTK-611, CTK-620L, CTK-631, CTK-731, WK-1300/1350, WK-1630 - WK1800 CPS-7 and CPS-85 Add an optional sustain pedal to your keyboard for easier playability. The SP3R is the new version of the older sp3 pedal and is the same pedal and works on the same keyboards.
Essentially all CTK and LK Casio keyboards.