I number my students every year for them to keep track of their materials. It's a lot easier for me, as the teacher, when I have students moving in and out of my classroom so often. Here I put together book box labels in 4 different colors that you can use for free! You can also use them to label other materials, lockers or desks as well!
The labels are numbered 1-32 with colors pink, lime green, blue, and purple.