This product from GunPrimer is similar to guide tape, but is already measured out for you and is transparent. Just count how many blocks you want and… snip, you have your line guide. Each block is either 2mm or 3mm wide, both are 3mm tall. You get 1 sheet, amounting to either ~2700 pieces in 2mm or ~1800 in 3mm, which equals 3 or 4 pieces PER PENNY. Thats a pretty good deal.