These rings are 1" medium height from 6061 billet aluminum. I have been using this brand rings on my crossbows and rifles for over a year. These rings are LNIB, and sold originally for $130. What I like about them most is that they are pic rail and STANAG 4694 specs. That means that the entire horizontal flat sits on the rail as opposed to just side "grip" of traditional picatinny type rings. The price listed includes shipping.