Diagonal Pure Carbon Fiber Ring
Strength: Carbon fiber has one of the highest strength to weight ratios known to man. These rings are comparable to wood rings in weight but comparable to steal rings in strength. Each ring can withstand between 100 and 400 lbs depending on the size and width of your ring. They are also incredibly stiff, they will never dent or deform and unlike tungsten they will not shatter if you accidentally drop them.
Weight: Not only are they incredibly durable but they are extremely light. Carbon is about 90% lighter than tungsten and about 50% lighter than titanium. You can barely feel anything at all when you're wearing one.