Extra-large grout sponges for professional tile installers and pool plasters. Our quality extra-large grout sponges have all the advantages of natural sponges and last longer. Our extra-large grout sponge measures 7.5 x 5 x 2 inches. Our grout and masonry sponge is the ultimate solution, designed and engineered by skilled tile contractors, concrete finishers, and pool plasterers to offer the most superior quality in the market. For grout sponges in different quantities page.