I was looking at one of them on their site, and noticed the ends aren't fully enclosed. They appear as if they're just a C channel of stainless. Am I seeing that correctly? Cuz they look really nice, but if they're not fully enclosed, it's a deal breaker for me. The whole point of getting one of these, with the 2.5mm springbars, is for durability. There wouldnt be any if it was just c channel right?