Its operation is similar to projector screen. Utilizing the elasticity of spring to facilitate blinds or shades to move up and down. Adding hydraulic reducer system to smoothen and quieten while moving up blinds.
Roller Blind Color Trends, Make Your Home Space With Character－Gray / Pink / Green
How Do Cordless Roller Blinds Work? －Honeycomb Shades TDBU & Curtain Blinds
