I bought both the Medium and Large sizes as I wasn't sure what size I needed. I got to try them both and found them to be well made and easy to use. I found that I had to slide the ends together instead of snapping due to my hand strength. You can remove them by sliding them apart or by pressing on the band connection to pop them apart assuming there is room between the band and the leg. They are brightly colored making them easy to spot and stay on very well. I ended up using the medium on my hens that are 7 months old. They are a perfect fit but I will monitor in case the birds legs get any bigger requiring me to switch over to the large. I could have used the large as it did not migrate over any joints but just looked sloppy.

They've broken off or cracked after just a week of the chickens wearing them.