Wall sponges are designed for vertical applications whereas floor sponges are designed for horizontal applications. The floor sponges are thinner and longer (5-1/4" x 13-1/2") than the wall sponges (6" x 11-1/2"). Both sponges feature a slitted design to allow for more grouting material to be grabbed and removed with each pass of the sponge, and either sponge can be used with sanded or unsanded grout.