When we first tested these water-absorbing mats, the results seemed too good to be true. So we asked some of our customers to try them, and they gave Hydro-Mats rave reviews! Each individual mat holds a full quart of water, wicking it up almost instantly and then releasing it slowly, so you water weekly instead of daily. Choice of a set of eight 7" x 7" mats or a 15" L x 21-3/4" W roll.