Bound in booklets of 25 sheets of numbers or arrows, each number is backed with a low-tack adhesive, meaning you can place the markers on evidence and later remove it without marking the surface. The Photo Numbers booklets come in both large and small numbers. The Large Adhesive Numbers are approximately 2" high and include the numbers 1-10. In each book, there are seven arrows which are .8cm (5/16") wide and eight which are 1.9cm (0.75") wide as well as a “North” arrow.