substrates prevent puncture and hard to tear
Desiccants are made of Montmorillonite (bentonite) Clay or Silica Gel desiccant material, packaged in printed nondusting sulphur-free Tyvek® substrates.
Size:1/3, 1/2,1,2,4,8,16,32 unit clay desiccant
More detail about NuPON Technology Phils. Corp.
Philippines