Specna Arms BBs are another product from this increasingly popular brand. All Specna Arms BBs undergo thorough quality control and, in addition to dimensional precision, also focus on the surface quality, polishing, and slickness of the BBs to achieve maximum and consistent flight trajectory, ensuring that each BB performs at its best on its way to the target! All Specna Arms BBs have a surface treatment to reduce vibrations in the inner barrel and improve contact with the Hop-up rubber.