Type: swing knifeBrand: MTechModel: dr-01rbsTotal length: 22.8cmBlade length: 9.5cmBlade width: 2cm (widest part)Closing: 12.2cm (handle length)Blade material: 440CHardness: 57 surface: Corrugated SteelBlade thickness: 0.3cmHandle thickness: 1.1cmHandle material: all steelNet weight: 140gPacking: original cartonQuality: export high quality, OEM.Due to the use of high-precision standard parts, all connecting parts are very coordinated and used as accurately as a clock! This knife was originally created by Darrel Ralph, a young American knife designer. Twist butterfly knife is the latest one in his V2 system. The spiral handle is not only as beautiful as a butterfly, but also increases the feel and pleasure. He used phosphorous copper washers on the handle shaft to make the knife fast and silent when swinging. The blade and package have copied the cursive signature of "Darrel Ralph"