Replacement Filters for NordicAir™ Mask Options:30 Replacement Filters What is this arm ring

What is this arm ring made of

It reflects the real Viking-age helmet

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it is a handmade item and ships in standard ring sizes

Authentic drinking horn — hand-picked and hand-polished by artisans

Replacement Filters for NordicAir™ Mask Options:30 Replacement Filters What is this arm ringReplacement Filters for NordicAir Mask! HOW MANY FILTERS DO I NEED? If the mask is worn daily a filter will last about 5 days. We recommend cleaning the filter every two days (with warm water and soap) so it will last as long as 10 days. Once the filter is uniformly light brown, we recommend switching it with a new one.