Here is a beautiful matching wedding band set that includes a 6mm and 8mm tungsten ring. This exotic Comfort Fit tungsten inlay ring style is made of jewelry grade tungsten carbide that contains no cobalt. The ring has polished beveled edges and has an inlay of beautiful laboratory grown blue/green opal. This style is available in both 4 mm and 8 mm for couples who wish to have matching sets, price is for the set. See full warranty details here.