Vorsk manufactures a variety of biodegradable (Bio) BBs, though they are primarily distributed in 
1kg bags or specific bottle counts rather than a single "6000-round" bag. For a volume of 6000 rounds at 0.20g, many retailers instead offer the 
Nuprol RZR 0.20g Bio BBs
, which are packaged in 6000-round resealable bags. 
Vorsk 0.20g Bio BB Options
While a single 6000-round bag may not be the standard Vorsk SKU, the following configurations are available:
1kg Bag (~5000 rounds): This is the most common bulk size for 
Vorsk 0.20g Bio BBs
, typically priced around £16.99–£17.99.
3600-Round Bottle: A standard mid-sized option for 
Vorsk Bio BBs
.
1100-Round Bottle: Smaller portable bottle for quick refills. 
Alternative 6000-Round 0.20g Bio BBs 
If you specifically require a 6000-round bulk bag, the Nuprol RZR series is the direct equivalent: