Review on 🚲 Cycling Replacement Activated Filters-Swapping for Enhanced SEO by Brent Henderson

The pre-punched holes don't fit the supplied keys, they are too small and had to be shortened a bit. The material is rough and rough against the skin with sharp edges. Otherwise it seems normal. I bought for my RZ mask but they don't quite fit. If this is your mask, keep looking. Update: After trying a few different things I found that the valves fit if you really force them, but it's very tight and only works with a thin mask, the RZ is too thick. It's not a total loss, I've found great use for it. I had a couple of hats so I just tucked the filter in between my socks and folded them in half. see attached pictures.