They are all Eb, but as cornets they need to look like the other cornets. Some have the double-shepherd's crook, which is supposed to sweeten tone, but the real difference is in how narrow they are compared to Bbs The bells are also smaller, and they seem to have shunts rather than triggers, I'm guessing because there just isn't any room for them when you sit one in your hand. They are cute, but the back-pressure is intense. When I first started to play soprano I ovedid it due to the novelty and I was actually forced to go and see the doctor because of the light-headedness I experienced. IMHO the sop is the real virtuoso of a brass band.