This axle set is for the 500A & 610A ski models
 
And yet it moves - Ensure your roller skis will traverse straight also in the future, we strongly recommend changing the axles for your roller ski wheels periodically.
 
The set consists of :   
Axle 15 c  X 2 pcs, nut 16 X 2 pcs, washer 18 X 4 pcs, spacer 14f  X 4 pcs
 
NOTE: To change the parts for both of your roller skis, you will need two of these sets.