Strong, lightweight, solid clips. Use these to attach my matte board to a homemade slide I made for a very dusty pastel. I attach a slide to my easel and put a matte board inside when I paint. The clips hold up well. There are small flat surfaces on the top of the clips that can be removed and one of mine cuts itself off, but only when I try to attach it to something. You get a set so great value for money.