there not paint balls they are hard like tic tak candy they wond break in a toy tank !
And by the way todays bio bb's are just the same quality as the AE .25 did you try TSD bio 180's ? they shoot just as good as the AE's and bioval bio's again very high quality.... I used all the high quality BBS and after using bioval and TSD bio 180 i will not waist my time polluting the earth with plastic there is no need for it when todays bio BB's are on par with the best ones out today...In fact in the future more and more BB's will be available as bio because airsoft playing fields are banning the use of the non bio bb's....