I ordered a few of these because I was looking for a comfortable whistle tip for my cartos. These are the perfect fit as far as feel goes. I know they are going to have them resized because they are to small at the base and don't fit in the cartos but that was a very easy fix. I put a small strip of electrical tape around the base of it and it fits nice and snug in my cartos and the tip is very comfortable in my mouth. Just wanted to say thanks to Gotvapes for continuing to come up with wonderful ideas and always continuing to improve on the products they already have. Thanks Gotvapes you guys rock.