Product Specifications:
Material: PVC
Color: Black
Base Diameter: 3.4cm/1.3inch
Clip Inner Diameter: 2.4cm/0.95inch
Suction Cup Height: 4cm/1.57inch
Package Includes: 12 aquarium heater suction cups
Usage Instructions: Suction cups work best when placed on clean, dry glass. After being used in water for some time, they may turn white and lose their suction ability. You can clean them with dish soap or vinegar, then rinse thoroughly with warm water.
Note: Suction cups wear out over time. Don't expect them to last forever. Most importantly, if old and worn suction cups still can't adhere properly to dry and clean glass, you need to replace them promptly.