The 9 frame spacer tool is used for a 10 frame hive. When you use the 9 frame spacing tool, the frames will be evenly spaced and reduce the chances of burr comb. With the frames properly spaced the honey bees will comb out the frames further so it is easier to de-cap the frames of honey. Additionally, when the frames are spaced properly, with this spacer, the honey bees will not create burr comb. The spacer is made of plastic and cleans very easily.