No More Wasted Food and Dirty Tank Water - This aquarium fish food ring helps keep the food stationary and from being sucked into the filter or pushed though the whole tank from the moving water. Contained feeding is also easy to train fish or turtles to know food location Strong and Adjustable - Suction cups provide sufficient anchoring even in moderate water flow and you can adjust the height and angle of it if your water level drops or raises Safe to Aquatic Pets - These aquarium food stations are made of PVC, non-toxic and odorless Inner Diameter of Circle: 5.5 cm/2.17 inches. Inner length of Square: 8 cm/3.15 inches. Diameter of Suction Cup: 3.8 cm/1.5 inches. Length between Rings and Suction Cup: 4 cm/1.57 inches Package includes: Feeding Circle x 1; Square Feeding Ring x 1 (Aquatic pets and other accessories are not included) These Fish Feeding Ring for Aquarium and Tank 2 Pieces Floating Food Feeders will be approved by your fish, turtles or other aquarium pets. It keeps the floating food from going all over the tank and getting wasted and stays in place with no slipping, which makes for an easy gravel cleaning when it comes to picking up leftover food. Recommend maybe taking out when not using it. The water will get a little stale on top.