UNIQUE DESIGN: suction cup curtains use 20 silver rings on four edges for suction cups. More strong Suction cups and rings make the curtain hard to fall.EASY TO INSTALL: By of sucker sticking without any messy sticker or glue to damage your window ( pictures or package instructions).EASY TO ADJUST: Suction cups allow you to adjust the width and length of blackout blind drapery, suiting for glazed / glass windows, sliding door, proof window.AMZING MATERIAL: advantage from the triple weave , the curtain can block 80-95% sunlight and UV ray, features on thermal insulated, noise reducing, privacy protection.blackout curtains with suction cups your peaceful environment. Used for the roof window / dormers can block the direct light . You can also use the suction cups to adjust the curtains. Keep the room cool in summer and warm in winter.The suction cup's diameter is 4 cm.Test it , weight test to 8 lbs. Can hold the curtain ,'t worry about the suction.TIPS:The suction cup you received may be bent due to packaging transportation. Pour boiling water into the bowl, the suction cup for 5-6 minutes, dry and use.The blackout curtains have a good shading effect .When you are traveling,can easy to carry it .colour:blackMaterial:Polyestersize:198*130cmPackage Contents:1 * Curtain20 * suction cups20 * rings