Laser-Dot 0.25 G Precision Biodegradable 6mm Pink Airsoft BBs 4,000 pack Material: Plant based plastic Precise weight calibration is important to achieve consistent flight velocities and range for sniper or fully automatic fire for the best possible performance. Highly polished ball surface reduces airborne friction and maximizes shot pressure, further increasing the reliability of shot range and velocity. The diameter of each of our airsoft BB's are calibrated to high levels of precision, ensuring proper spacing between the BB's surface and the barrel diameter of the highest quality airsoft guns. The consistent and correct sizing of each BB provides increased durability and accuracy. Maximized in-barrel pressure also increases the range and velocity of every shot. Seamless spherical design, precise spherical shape, size and smooth surface provide high performance capabilities when used in high quality airsoft products.