Strong Adhesion: Crafted from sturdy PVC materials, these suction cups provide excellent adhesion to securely hold air tubes in place, slippage in various aquarium environments sturdy & Resistant: The PVC materials superior resistance, maintaining stability even with prolonged water exposure, ideal for long term use in fish tanks Wide Compatibility Design: Suitable for air tubes with diameters from 4mm to 6mm, these clips fit perfectly without adjustments, simplifying management of complex aquarium systems for home and professional use Quick & Easy Installation: Without tools required for fast setup and removal, saving time and effort during frequent aquarium equipment adjustments or maintenance routines User Friendly & Safe materials: PVC ensures complete for aquatic creatures, making these suction cups ideal for sustainable hobbyists maintaining underwater environments, Manufacturer: Greabuy