The 3M Secure Click Particle Filter D3125, P2 R, is a filter that combines protection and comfort and is lightweight. When used in pairs, our filters offer low breathing resistance and a good balance with an optimal field of vision. They can be quickly and easily attached to the 3M Secure Click HF-800(SD) series half masks with a click. 3M Secure Click™ Particle Filter D3125, P2 R2