U by Kotex tampons

So, I'm a younger girl and I use the regular clicks by U by Kotex. I want to try the Sleeks because, well, they're sleek. Has anyone tried them before? How much smaller are they? I'm almost out of my clicks so if I can I'll probably try them next. However, my mom obviously doesn't want me using them because a week later she bought me two packages of pads, heh. Well, thanks for any advice and for sharing your experiences!