Grit guide.
Three grits, one installed, one included as a spare, one available as a refill. Here is what each one is for.
The three grits
80 GRIT
Spare, included in the box
A softer starting point if 120 feels too aggressive at first.
120 GRIT
Installed on every board
The one most dogs run day to day.
220 GRIT
Refill only
For a dog already confident on 120 who does not need as much bite.
Replacement sheets ship three to a pack, one grit per pack, on therefills page.