The lezyne twin speed co2 puncture repair kit compact all in one co2 and tire repair kit includes twin speed drive two threaded 16g or 25g co2 cartridges and lever kit custom neoprenevelcro strap secures all items together kit easily fits in most packs jersey pockets and on seat posts lezyne twin speed co2 puncture repair kit weight 16g cartridge 177g 25g cartridge 270g