100 extra large grout sponges @ $.99 each for professional tile installer and pool plasters. Our quality extra large grout sponges have all the advantages of natural sponges and last longer. Our extra large grout sponge is the original measures 7.5" x 4.5" x 2.2". Our original grout sponge has been made the same material and round edges since 1986. Designed by tile contractors with plasters to retain water when used with high alkalinity types of cement. For grout sponges in different quantities visit our Grout Sponge page.