The suction cup is made of durable clear PVC material with metal screw, soft but strong, non-toxic and odorless. It does not yellow easily, has a very strong adhesive. When the screw suction cups are used correctly, they are particularly resistant on all smooth surfaces such as windows and glass plates. Package includes 20 transparent suction cups, good value for money, enough to meet your various needs. The suction cup can be attached on the suface simply by sliding, without drilling and gluing thanks to the vacuum effect, you only just clean the surface and press the suction cup tightly. The transparent fixing suction cup is suitable for fixing signs, decoration, shower trays and rattan furniture or also as a holder for towels, string lights and decorations for the home or car. Product colour: transparent M4/M5 caps nuts (optional) Quantity delivered: 20 pieces