Cobaltium is perhaps the most popular of the M3 options. The blue part of the material is made from aluminum that has been dyed blue, the black is graphite. Since M3 is made with real metals, it does weigh more than straight resin blanks. However, this is one of our lighter options, so it's a great choice when you don't want to add a lot of weight.
Please note: All of our M3 blanks are square at this time. We're still working on getting the rods perfected with the new urethane based material.