0.20g Systema 3000 BBs.
These high quality BBs are manufactured by Systema in Japan. Systema is one of the oldest companies to produce BBs for the airsoft market are considered to be very good quality. These BBs were originally produced for use in the Systema PTW AEG which retails for $1200+, so you know that these will be of the best quality. Produced with a very high polish, they are recommended for all AEGs, gas-guns, and spring guns. The exacting standards involved in production make these perfect for use in high tolerance, tightbore barrels.