Biodegradable bb pellets will Disintegrate after some time in your garden or the site you are playing on and are normally non-toxic and safe if your pet eats them, but please check the label if you buy some. Usually, Biodegradable bb pellets will cost a little extra than their non Biodegradable counterparts. One other thing to consider is that they break easier on impact so if you're shooting at someone who has a mesh mask on they can break, and fragments could go through the masks mesh. Some skirmish sites (in woods) and some countries (like Holland) only allow you to use Biodegradable bb pellets so they may be your only choice. They are probably the best bbs to buy if your shooting in your garden as you won't have to bother to pick them up if they annoy you. The 0.25g bb pellets here are a good weight ammo to use with sniper rifles or high power electric rifles and gas guns etc. a rough guide would be for example airsoft guns that shoot between 350 to 480 fps would be best to use with the 0.25g. Need more info? Click here to see our BB Pellet Buying Guide for more info on our bio bb pellets.