1.Strong Bearing Capacity 2.Double vacuum suction ensures it can work in different temperature. 3.No need to use glues or screw, easy to use and can be reused, very friendly for the tenants and traveler because when you move it 't damage the wall and left. Warm Reminder: Please confirm whether the suction cup hooks sucks firmly before hanging heavier objects or valuable items. These suction cup hooks are not suitable for powder painting wall, stone wall, wood wall and other rough walls. Colour:Transparent Material:PET Package Contents: 4 x link Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.