The Lezyne Twin Speed CO2 tyre kit is a compact, all-in-one CO2 and tyre repair kit. Compact, all-in-one CO2 and tyre repair kit. The Lezyne Twin Speed CO2 tyre kit includes Twin Speed Drive, two threaded 16g or 25g CO2 cartridges and Lever Kit. Custom neoprene/velcro strap secures all items together. This Lezyne twin speed CO2 kit easily fits in most packs, jersey pockets and on seat posts.