The LWRCI RailSkins rail covers slide easily on Picatinny rails and lock firmly in place. The unique snake scale pattern provides positive non-slip grip even when wet or oily. Made of an extremely durable space-age polymer, they are nearly unbreakable. The heat-resistant properties of this polymer can withstand the harshest of firing while their narrow profile provides for maximum air exchange and cooling of the barrel. 6.25" length for each RailSkin.