Red - The old standby. These have been used in the ski industry forever and are very reliable. Smaller in size but stretch considerably, may not be appropriate for extra wide ski brakes. Sold in a 4 pack.
Black - Stiff - Very stiff and will not wear out. Extra thick and will be good against cuts from ski edges. Burly... Sold as a pair.
XL Black - Long - Extra large, great for any large brakes. Thinner and very stretchy. Also good for holding ski tip and tails together in storage or transport.