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I also wanted to share that Mr. Tomoyuki uses mostly G10 composite material for the knife handles/grips. Listed below are the properties of this material: 'G-10/FR-4 is a thermosetting industrial laminate consisting of a continuous filament glass cloth material with an epoxy resin binder. This product, first introduced in the 1950's, has characteristics of high strength, excellent electrical properties and chemical resistance. These properties are maintained not only at room temperature but also under humid or moist conditions. Today what is called G-10 is actually FR-4, the flame retardant version of G-10. The material FR-4 can usually be used where G-10 is specified, however G-10 should not be used where FR-4 is specified. Both G-10 and FR-4 are rated at 285 degree F continuous operating temperature. Because they are thermosets, no melting will occur with these grades, however charring will be observed after extended periods above the temperature rating. FR-4 has a flammability rating of 94 V-0. With these outstanding characteristics, it is easy to understand why G-10/FR-4 is such a versatile material and is used in a wide variety of applications. Properties: High dielectric strength, Radiation resistant, High tensile strength, Low cold flow or creep, Chemically resistant, High flexural strength, Dimensional stability, Low moisture absorption, Low dissipation factor, High impact strength, Cryogenic serviceability.'