These kabobs are a must have for all birds! You can put fruit and veggies on it, or you can put toy parts on it. Or you can even put both. Either way, you won't go wrong with this purchase. These last for ever. I have some that I've had for twelve years now. You just can't wear them out. This size measures 19" long, and the acrylic ball is 1 3/4" in diameter. The way you use these is, you put the stuff on the rod that you want, and stick the threaded end through your cage bars from the inside, and put the ball on the rod on the outside of the cage. Because your bird cannot get to it on the outside, and they really can't get their beak around the ball very well, they are impossible for your birds to undo. For this size you will want to make sure your cage bar spacing is no more than 1 1/2" inches. These can be hung from the top or the side of your cage. They work well in either place. They are made of solid stainless steel, and come with a plastic washer on the bottom.