This is the second time that I have controlled these bells and I recommend them 100%. I recommended them to the 1 year old bou because my horse which is outside 24/24 is on it but it helped me to limit the bills of marshal.
They are very hard to put but they are very solid. Personally I left them on my horse's feet to their wear. They are too difficult to remove.
I took size XL for a horse of 1m80 SF.