The HELIX.iso™ replacement pack (filters 80% of particles down to 0.3 microns in size) are available for individual purchase or as part of the bundle. Please see the information and detailed specifications on these filters here. Dispatched in a sealed plastic bag. These filters are designed to be worn in conjunction with the masks sold on our website or your own home-made mask

This box contains 20 sealed packs of 7 filters totalling 140 filters all together.

https://www.lanaco.co.nz/Lanaco/assets/File/SewingHELIX_iso%20mask.pdf

Face Mask Filters - Box of 20 x 7 packs. 9204