Intelligently designed bird-shaped climbing holds that all offer a jug—a great way to teach kids different species of birds while offering them an easy-to-grab hold. And let's be clear, these are not just some 2-dimensional hold that the kids "may" be able to hold. The kids will hold on to them and have fun while doing it. I designed this set using my 4-year-old daughter to test them on. She can navigate a vertical wall on them with ease.