Made of flexible polypropylene material that will not break and resist crushing. This crown and bridge box has a positive lock-in mechanism. Top and bottom connect with a flexible hinge. It is an attractive crown and bridge tooth box that is available in a wide variety of fun colors to work with. Using two crown and bridge fillers per box provides maximum protection for contents. Available either in plain, already approved artwork or custom printing. For custom printing the one time $35.00 dollar die charge covers the cost of preparing the metal die, which is retained in our files for repeat orders.