Swiss Arms Bio BB's (0.25g) (4,000 Rounds)
King Arms BB's are widely regarded as one of the best precision BB's on the market. They are seamless, polished to a high standard, and evenly weighted to ensure excellent consistency.
The biodegradable series of BB's from King Arms are no exception - they are the same high quality as their platinum series, but more environmentally friendly. What's more is that you get the same performance from the bio BB's as you do from the platinum, which is a major plus given that one of the biggest bones of contention with people is that their performance suffers when using biodegradable BB's.
These particular ones are the 0.25g 1kg bags, which hold 4,000 BB's. Each BB is polished for superior feeding, and will work even with 6.01mm Tightbore Barrels.