These are packs of five threaded CO2 cartridges for use with all Lezyne CO2 inflators and most threaded-cartridge compatible inflators. They are available in packs of 16g or 25g sizes.
Features:
16g CO2 cartridges are suitable for most road bike tires
25g CO2 cartridge will fill a 26 x 2.5" tire to aprox. 40psi
Works w/ any threaded CO2 inflator

Specifications:
CO2 Type: Threaded
Cartridge: 16g or 25g
Package Size: 5 Cartridges