The Magnetic Bong Scrubber works just like the classic Bong Buddy Magnet Kit. The old magnetic bong scrubber only fit though 18mm female joints or openings larger than 15mm. This magnetic scrubber fits though both 18mm and 14mm female joints! This kit also includes six sceubbers and two magnics. A cleaning brush can't get around those corners very well and sometimes liquid cleaners just don't do it. This kit allows you to get to those hard to reach places in your water pipe or bong.