Puro means "professional" in the Japanese language and every part of the filter shows the professional standards.
Kenko Puro UV MC PROTECTOR is a precision optical glass photographic protector filter designed to shield camera optics from scratches and dust.
Kenko Puro filters are a Kenko Imaging USA exclusive product.
Find more details here: https://kenkoimagingusa.com/collections/uv-filters/products/kenko-puro-uv-mc-protector