Package includes (1) .001 (1) .002 (1) .003 and (1) .004
By using these shims in combination you can have any thickness you need between .001 and .010
gunthings (the only place I know of that sells them) gets $7.00 (+ shipping) per shim.
I'm selling the above 4 shim package for $10 shipped.
If your barrel over times, you will need these shims to build your rifle.