The Masks are manufactured by The French personal protective products company, Delta, and have been marketed with more than 1,500 products to provide head-to-toe protection to users, mainly in the industrial and civil sectors.Most of Its products are manufactured and sold according to Eu standards.

Excellent filtration efficiency is the traditional advantage of Delta masks.In 2014, the China Consumers Association tested 37 kinds of masks in six Chinese cities, focusing on three indicators -- filtration efficiency, respiratory resistance and tightness -- according to national standards.Among them, The folding and cup-shaped masks of Delta have excellent filtering effect, with scores basically the same as 3M and respiratory resistance lower than many domestic manufacturers.