B74 O-ring Battery Strap is a NathoBuilds option part for the Team Associated B74 4wd buggy. These battery straps offer a secure adjustment of your shorty pack. Unlike the kit carbon strap with 2 nuts, these battery straps stay secure to your battery pack and make it quicker for you to change the pack over. You can change whether you would like your battery pack back or forward by just swapping the plastic strap over. An O-ring holds your pack secure enough to keep it in place, but also flexible enough to allow for the chassis to flex underneath. The O-ring straps are centrally located to the battery strap, so the O-ring is securely located to where you placed your battery pack. Like any NathoBuilds products these have been tested on multiple cars on different track conditions. If you are looking for that extra edge in your Team Associated B74 these will make your racing experience more enjoyable.