This Bear Song IV butterfly knife represents the latest collaboration between BladeRunnerS (BRS) and Bear OPS. It is a lightweight flipper that is designed to be your go-to everyday carry knife. This B-410 model features blue raindrop handles, stainless steel spacers and a swappable latch. The pivots have 304 bearing surfaces and phosphorus bronze washers. The bead blast finished stainless steel tanto blade has a double tang pin design for great performance.