Toby's disposable nose filters consist of two units connected with a clip and two filters; the safety clip allows for easy insertion and removal of the unit. The nose units (and clip) are made of a soft, surgical-grade C-Flex plastic which opens the nostrils for natural breathing. The filters, which are located in each of the nose units, are made of various materials depending on the intended use. The white cellulose-polyester filter, our basic particulate filter, Improves Air Quality™ and is very popular with the spray tanning industry. The "dual" white and black filter is made of activated carbon with a polyester backing, which does everything the white filter does, but it's also effective in reducing odors. Toby's Nose Filters™ are patented (# D451,193). MaxAir™ Nasal Dilators Patent Pending.