Extremely well made and consistent in size and weight
Size = 5.95 +-0.01mm
Solid construction (no air bubble meaning BB is perfectly balanced)
Do not crush easily
Zero jamming with Promethius 6.03mm super tightbore barrels
Using good BBs not only prevent jamming and inconsistentcy in your rifle, It will also increase accuracy, range, and FPS. Well made BBs that are consistent in size and weight prolong the life of your internal parts especially your barrels.
Never compromise, use D.O.S. BBs!