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 Small Adhesive Numbers booklet contains the numbers 1-15 and one “North” arrow on each page. Each marker is 1.9cm (0.75") high. 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.