Replacement Rubber Pivot Cups for Sure-Grip Plates, available in small blue inserts for Junior Pro plates and also fits many Vintage skates.
 
Each plate requires two pivot cups, so be sure to purchase 2 packs for a full set!
 
Measurements:
Outer Diameter: 17/32"
 
Inner Diameter: 9/32"
Height: 17/32"
 
Sold in packs of 2 - one pair of skates uses four (4) pivot cups.
 
Compatible with:
Junior Pro plates
Many Vintage adult size plates