Coiled Roll of 1 Inch, 25mm Quality Standard Metric Ribbed Black Pond Hose is ribbed externally but smooth bore inside means the Cypriflex hose does not kink and there is minimum water flow restriction. Anti-Kink Cyprio Pond Hose Tubing provides all the strength and flexibility required in pond applications. Made from High Quality PVC. The thick and durable hosing is reinforced with solid concentric ribbing that will not collapse due to back pressure or the light of weight from gravel and covering material. The tubing material is thick yet flexible and is anti kink, ensuring minimum water resistance and maximum water flow, even in turns. The black hosing does not encourage the growth of algae and can easily be camouflaged. The 25mm Pond Hose tubing is non-toxic and is fish & plant safe. Will fit all Metric applications like Hagen/Tetra/Fishmate/Oase. Please note: WILL NOT FIT AMERICAN STANDARD ITEMS.