The Steadman is constructed with an aircraft grade birch core providing exceptional strength and durability. This also helps keep the frames slim and lightweight. They come standard with stainless steel spring-hinges providing a custom fit and personalized comfort. Each pair is outfitted with polarized lenses and comes in a handmade padded pouch. Specifications: - Frame measurements: 53-19-145 - Polarized lenses - Stainless steel spring hinges - Aircraft grade birch core - 1 year warranty