AX organic gas [Bp<65°C]. Single use filter. Revolutionary EasyLock filter system with no additional clips or holders. Different gas and particulate filters can be combined. EasyLock® gas filters can either be used on their own or combined with the EasyLock® particulate filters.Any combination of filters possible, simply click together, there is no need for additional clips or filter holders. 1 BOX = 8 FILTERS (NOT PAIRS)