i have tried some from ft and 3fv. they have been hit or miss. for example, i got a couple different packs of 10 wraps with different graphics on them. lets say the 'wolverine' ones all worked as expected, then the 'darth vader' ones like 6 out of 10 crack or split putting the battery in, the ends curl up, etc etc. ft and 3fv are the only places i have noticed them for sale, so im wondering if there is a higher quality/more consistent source i am missing somewhere. also, is there any difference in plain wraps and wraps with art and designs on them? the stock/plain wraps the batteries ship with feel like they are way tougher than the cool art ones i bought. i would prefer toughness to coolness though, if there is a choice/difference.