My black cat is a great hunter. He has brought in birds,mice and even a bunny! After the bunny incident I knew I had to do something. I started buying these three years ago. They are pretty,durable,washable, my cat doesn't mind them and they make him easy to see. Birds see colors, so now they can see him coming. They are trimmed with reflective material too.This has reduced his bird kill from 2 or3 a week to or 1 or 2a month.