Exquisite and professional workmanship makes it very flexible and durable. The excellent function makes it can effectively prevent the water from flowing down the pole to the palm when rowing.Wear-resistant and reusable feature allows it to be used for a long time. Simple and easy installation and use will not waste your energy and time.Made of PVC material, it is very durable to use.The inner diameter is 3cm, the outer diameter is 5.8cm and the thickness is 0.25cm.It can fit paddles with a diameter of 30 or 29.Item Name: Paddle Water Retaining RingMaterial: PVCFeatures: Wear-resistant, Simple Installation, EffectiveSize Details: Inner Diameter: 3cm/1.18" (Approx.)Outer Diameter: 5.8cm/2.28" (Approx.)Thickness: 0.25cm/0.1" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:4 x Paddle Water Retaining Rings