Beautiful Hawaiian Koa Wood and Abalone Inlay in Strong and Heavy Tungsten Carbide Smooth Insides Comfort Fit with Protective Coating for the inlays. Tungsten rings are virtually indestructible and scratch proof. They are polished with a diamond compound, resulting in a polish and shine that will last forever. Tungsten rings have the perfect combinations of super strength with style and comfort and are the most wear resistant rings available on the planet. Tungsten is harder that 18K gold by about 10 times, 5 times harder that tool steel and 4 times harder than Titanium. Tungsten Rings will hold their shape and shine longer than any ring on the market. Tungsten rings will not bend.