Material: Plastic. 30Cm model Number of holes: 8, Number of holes in 40cm model: 14, Number of holes in 50cm models: 18. Reasonable Design: Our hummingbird window feeder has a clear acrylic body that allows you to see the volume of liquid in the tube at all times, and the 1.5" diameter of the tube allows the hummingbird to drink the last of the water in the tube without wastage. Sturdy and Durable: This hummingbird feeder for window comes with 4 stainless steel stands that hold the feeder securely in place and will not wobble even in windy or rainy days. The sugar water will always be stored in the feeder intact and you can watch this entertainment at home with peace of mind. In addition, you can remove the feeder at any time for easy daily cleaning. Silicone Feeding Hole: Our hummingbird feeder window mount has a silicone feeding hole in the shape of flowers in a bright red colour that is more attractive to hummingbirds and most importantly, the flowers shape will not harm the hummingbird's tongue like metal flowers, so you can use it with confidence. The Perfect Gift: You can give our window hummingbird feeders as a holiday or birthday gift to elders, children, friends and relatives who love feeding hungry hummingbirds and they will be overjoyed as it is a very loving and unusual gift.