The caps I received did not look as powdery white as in the Revain photo. They were jet black, smooth to the touch, soft and flexible. I like the Mr. Seal brand because the rubber is thicker than other brands and will last my bikes for years in the rain and sun without drying out or cracking. Rats - this is starting to sound like one of those paid reviewers - but I don't think Mr. Gasket could afford to pay for reviews for $8! Sizes 1/8", 3/16", 1/4", 5/16" and 3/8".