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Most aren't polished so they tend to chew through your hopup rubber faster. The only "good" bio bbs are the bioval ones, but they are quite expensive (about 50$ for /3700) they biodegrade in a couple of months and are highly polished. Also they do not dissintegrate on impact. In fact I've shot a metal bell at 20ft with these and they've left dents but remained intact. Every other bb including bbbastards split in half or fragmented off.
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