I purchased this sight at the beginning of this year, and have used it quite a bit through the spring. It is a sliding, one pin sight system. Aluminum construction, smooth sliding lever. I especially like the large aperture, it lines up great when looking through the peep. The sight comes standard with a .040" green pin, which should show up great in low light hunting situations. .030" pins of various colors are available as options. My previous sight pin was a .030", but I didn't notice any increase of group size in going with the larger pin. The sight bar locks in securely, and the sight makes no noise or vibration whatsoever. The plastic aperture is protected by an aluminum housing, and the no-tool, micro-adjustable windage made sighting in quick and painless. This has been the best sight that I have ever owned, with all the features that I could want. If your looking for a one pin system, I think you will be pleased.