Just insert the slippers into the four corners of the sliding shoji that are easy to slide in. Just plug it in, and say goodbye to the frustration of sliding threshold doors. [Features] For fusuma rattle, skimmer, and slippery. Simply insert it into the 4 corners to eliminate the frustration of sliding doors. Just push it into the four corners of the sliding door that you use on a sill door such as fusuma or shoji etc. Simply insert it into the 4 corners of a rattling fusuma or shoji to eliminate drafts. Simply insert it into and eliminate the frustration of sliding doors that are difficult to open. The gap between the fusels/sliding frame is filled, reducing the rattling of the door. Perfect for cleaning old sliding doors!