I ordered the pair and I was very happy with them! The acrylic is thicker than on a hawley to accommodate the expansion screws. One note on the upper plate I received, it was designed like the blue and red plate on the website, not like the red, green, and yellow model. The pelottes are just below the teeth on the lower plate and are designed to push out the lower lip. I ordered headgear tubes on the upper and lower plates, with two facebows it was quite the experience. I unfortunately lost most of my appliances in a move and I am trying to build up again or I would share pics.