This is the hard to find 8 x 15 inch Bona mop base. You will find this larger size is appreciated when you have a larger floor area to clean. The 8 x 15 mop base can be switched with the Bona 4 x 15 base. Simply unscrew and switch them. You can use the Bona 8 x 15 microfiber mop pad or terry cloth mop pad with this base. Use the terry cloth for dry mopping and the microfiber for damp cleaning. Mop pads are machine washable up to 300 times, making this an economical choice. You will find this 8 x 15 mop base a helpful addition to your cleaning arsenal.