These Madbull BBs are constructed from Certified P life material biodegradable material that goes through a few hurdles to remove any imperfections or abnormalities. The careful manufacturing make these BBs accurate and help prevent jamming and smashing. They are packaged in a double seal bag to help keep them from spilling and to help keep them dry and clean. Specifications * Dimensions: 5.98 mm * Quantity: 4000 airsoft BBs per bag * Design: All electric high power spring gas guns Features * Multi Polish Process * Double Seal Package * Accurate without Jamming