Replacement foam for NANUK 918 3UP Revolver Case. Made of high-quality polyurethane foam, the multi-layered set of customizable inserts includes a pre-scored removable layer. This solution is ideal if you are seeking a quick and easy way to protect and organize your Revolvers. This foam fits the Nanuk 918 hard case. It also comes with the eggshell foam that goes in the lid of the case.