Cube-X are built on the Doobies platform of a double cut centre dowel. The big difference; the exterior 4 slatted bamboo surround the double split centre core. These are very tough. By leaving the outer skin on the bamboo, it has increased the strength and density. Where other bundled concepts may fail heavy hitters, these rugged sticks can take a beating! Although these are more dense and heavier, they are still quiet and may a great specialty stick.