The West Uranium Black is the fourth high-end aluminum yo-yo made by Black Cement. It may look like the original West Uranium, but the inner structure has big differences. First one is the response system had been changed to friction stickers. Sticker platforms are deeply recessed , same technology as Mini 7. Second change is thinner walls, extra material is used on adding diameter and width which increases sleeper time. Because of this change, the yo-yo is meant to be weaker than the original West Uranium. Third difference is a slighty change in the outer shape, from roudish to more squarish. All changes on West Uranium Black require advance players in order to perform its excellences.