O Venture Big O Key Ring saves yOu frOm never lOsing yOur keys again O Venture Keyrings Luxe Leather Bungalow 123 O Venture Big O Silicone Key Ring $25.00 Saint Bernard O VENTURE Big O Key Ring Quicksilver Solid O Venture Big O Metal Key Ring $30.00 Saint Bernard. Equal parts sweet and sassy, Pastel Leather Big O Key Rings are a collection of subtle, spring inspired hues that get along well with everyone. From textured, embossed varieties to classic, smooth leathers with contrasting trim, Pastel Leather Big Os are designed to free your hands and make less look luxe. Genuine leather circle key ring 4 inch diameter Oversized bracelet key ring fits over your wrist or above your elbow Signature locking clasp secures keys with a click The original, patented O key ring design