Bill books come with duplicate and triplicate copies. Duplicate copy means it will be 1+1 booklet i.e. 1 parent copy and 1 duplicate copy. Triplicate copy means it will be 1+2 booklet i.e. 1 parent copy and 2 duplicate copies. These books and vouches are widely used almost in all companies which have not yet shifted to POS invoicing system which generates the bill automatically.Proper maintenance of the record and no major qualification required for using bill books is another advantage. We can customize your order if you are looking for a thicker parent copy or duplicate. You can also go with white duplicate copy instead of the color paper.