WRP-S405-Seat Guide Wheel (set of 4)

WRP-S405 Guide Wheel set of 4 wheels.
Used For; holding the seat to the dual rails.
Used By; Late S3, S4 and M1/ S1 Models 

These four wheels are located underneath the seat.  The diameter of the guide wheel is 3cm.

For older WaterRower models, choose the WRP-S400, which are wider in diameter