These O-Rings are Welded Steel, Anodized Black. They come in 3/4 Inch, 1 Inch, and 1 1/2 Inch sizes, and are measured by the inside bar where your material would attach to the O-Ring. So, if you are ordering 1" webbing you would want to order a 1" O-Ring. These particular O-Rings have been anodized, in the color black, and are more resistant to corrosion and have a durable color. For more information, please click on the RED technical specs tab above.Follow us on Twitter for links to daily specials, "Like" us on Facebook for access to a coupon code for your next order & subscribe to our Youtube Channel. Discounted at only: US$ .33