Sold by Agility Brands and Fulfilled by Amazon. 1 X Cut-to-Fit Carbon Pad for Air Purifiers 12.9 x 9.2 x 2.8 inches #531 in Home Improvements (See top 100) See all 717 customer reviews See all 717 customer reviews (newest first) Good service with fair price I cut this carbon pad to fit as a pre-filter for my HVAC return. The return is close to my teenager's room and there is always a musky odor from coming from his room. Perfect for my needs Finally got around to replacing my filter after two years, and gave this one a shot to add on to as an extra filter for my sharp plasmacluster air purifier. You can definitely see thin areas on the filter sheet. Because of that comment from another reviewer I bought the more expensive version hoping that I would not see this issue,... This product is not bad for the price. It comes in a large sheet that you can cut to fit for whatever filter you have. I am using this with an Idylis IAP-10-100.