Blackburn 16 gram non-threaded threadless co2 cartridges that can be employed in any 16g threadless co2 system. The 16g size cartridge is perfect for 700c and high pressure 650c road tires but can be used to jump start or finish off MTB tires from 26" to 29"rs. Due to International shipping regulations we can only ship domestically. NO INTERNATIONAL BIDDERS PLEASE!!