|ICS brand .20g bb's, 3500 rounds in each bag, color is white. Competition grade. Biodegradable BB's. HIGH QUALITY. MC-174 *Decompose time varies depending on weather conditions. P-Force Biodegradable BB can degrade naturally within 6 months. Put P-Force Biodegradable BB in water and see how fast it starts to break down for yourself. For even faster action, place in hot water.