@annie1 the chirp wheel is a foam roller I guess. It has 3 different sizes with a groove in the middle for your spine. It stretches and massages. There is a large, medium and small one. The small one for your neck is the one I use the most. It has different size knobs for different pressures. I lay on the ground and put it under my neck. It hurts but seems to help. Its easier than a foam roller for me anyway.