these are my 3 extremes, the 2 black & white ones are over 2yrs old the one on a gneck has had corners cut off cos it lost its bristles & gets used x3 a month the other gets used every day, the hybrid has had mebbe less than 2 mths use
ive no idea why the first 2 have lasted so well, i haven't done anything different with them, first cleans, fsg cleans etc so i was well shocked by the hybrid & how quickly it wore out
maybe alex will be along to explain it all