Taken from Bowdocs restoration 101- "Sorry I missed that one; yes 2-3 oz veggie or veggie-tanned leather. I buy maybe 2-3 hides at a time and get the thinnest ones I can find in the stack. I also scrap as much or more leather then I use. I only use the cleanest parts with no cuts or scrapes in the leather. A little discolored leather won't matter to much as I'll dye the leather if the color is not somewhat
correct."