Columbia River Knife & Tool BIWA, 3.02 Fixed Blade, Plain Edge, 8Cr13MoV Steel Blade, Satin Finish, G10 Handle, Thermoplastic Sheath 2382 When even just the slightest extra weight matters" the Biwa /bee-wah/ lightweight hunting and fishing fixed blade knife is choice. At only 1.6 ounces" it tucks away as inconspicuously as a few extra dry flies but comes out swinging when a high-alpine trout hits your line.