The Big Blueprint Poly Hangers are strong, reusable and inexpensive. Literally 1/3 the cost of other aluminum hangers, they store a lot more blueprints in much less space! Each hanger holds up to 50 prints and is made from high density linear polyethylene. A common, heavy duty office stapler is all that is required to secure your plan set to the hanger. Just roll the plans up on the hanger for easy transportation of plans. Its simple.