Extra-large grout sponges measure 7.125" x 5" x 2". Grout Sponges Extra Large 400 pieces are packaged for large contractors and projects. Our Grout Sponges were formulated for tile contractors, swimming pool plasters, and masonry contractors to stand up to high alkalinity types of cement in 1986. Our grout sponges have been made the same with round edges and high solid content that gives the sponge body for holding water during grout clean-up and other masonry jobs. 400 PC Extra Large Grout Sponge bale is compressed for bulk purchasing and shipping purposes. Information about storing bulk grout sponges.