Replaceable dust mask 7121R-03 type - Dual type with RL3 filter media arranged on the left and right. RL3 class lightest 158g dust mask. The head strap is made of a three-dimensional poly-band that provides excellent wearing stability. The filter is an alpha ring filter that is made of ultra-thin glass fibers that are molded into a round pleated paper, enabling high collection efficiency and long-term use. By adding advanced processing technology to this alpha ring filter, we have expanded the filtration area to a maximum of about 12 times the bottom area, enabling even higher collection efficiency and longer use. Level 1 for dioxins. Asbestos removal work level 2-3. Model Name Sakai Type 7121R-03 National Test Passed No. TM225 It is a high-performance dust mask classified as "RL3" with a particle collection efficiency of 99.9% or more. Respirator Koken 7121R, Koken Gas mask 7121 RL3, koken mask 7121R-03 RL3, Masker Koken 7121R, masker pernapasan koken