1. The watering bags with 37L, 55L or 90L capacity promote the growth of trees and release the water slowly within 5 8 hours. This deep nutrient supply reaches the roots of the tree. They are great for freshly transplanted trees or trees in hot summers as they retain the water needed for growth. 2. DURABLE HIGH QUALITY These tree watering rings are made of durable and weather resistant PVC material. They are tear resistant and can withstand damage from branches. After filling, they can easily withstand pressure. 3. MULTIPURPOSE These slow release watering bags are suitable for seedlings and mature trees. Each tree watering bag is suitable for trees with a maximum trunk diameter of 140 mm and a minimum height of 150 mm. 4. Function Expansion The water inlet is equipped with a screw cap for easy opening and filling of water. A diameter of 30 mm (1.18 inches) is sufficient for most common trees (up to a length of 25.40 mm (1 inch)). The watering bag is equipped with a slow drip system that distributes water flow evenly and prevents blockages.