I hope the cost for the kit wasn't a lot
None of the Halinski kits i have are loose leaf, always in booklet format.
From what I have seen in my kits, there are usually 3 cardboard thicknesses called for
Bristol(a couple of sheets of your favorite stock laminated together)
* usual means 1mm thick cardboard
** probably 1.5 to 2 mm thick cardboard
|