MR. SIGA Super Absorbent PVA Sponge Mop head refills, Pack of 3, Grey, Size: 11.5cm (4.5’’). New improved PVA Sponge has super absorbent, can absorb liquid quickly and keep your floor dry and clean. Features in Horizontal grooves, lift dirt off floor surfaces. Instructions: to replace the sponge, hold the middle point of the sponge, pull upward and the sponge will come off. To assemble the sponge, put the sponge on the joint in one end, and then the other end.