These are BIO BBs. 

• The precision manufacturing process ensures consistency (5.95mm+.01mm)
• Perfectly spherical, double-polished, free of imperfections, and zero air pockets. 
• Designed to handle any FPS range without shattering or breaking
• Improved accuracy and shot consistency
• Made of PLA
• Precision made for high-end airsoft guns
• Performance and Quality is similar to BLS BBs!

What you get in one bag:

.20G BB - 5000 BBs

.25G BB - 4000 BBs

.28G BB - 3500 BBs

.30G BB - 3333 BBs

.32G BB - 3125 BBs

.40G BB - 1000 BBs

Recommended Power to BB Weight:

0.20g: 240~370 fps
0.23g: 330~430 fps
0.25g: 350~480 fps
0.28g: 390~500 fps
0.30g: 400~600 fps
0.40g: 450~600+ fps

*The chart above is for reference only. The best way to find which bb weight is best for your gun is to test them.