Abstract: A binding having a binding body which has, mounted in it, at least one return spring, adjustable means for prestressing the spring, and means for indicating the prestress of the spring which consist of a cursor linked kinematically with the prestressing means and a graduation in front of which the cursor moves, the gradation and the cursor being covered by a transparent part. The body is at least partially covered with a casing (18) that forms a protective cap and has at least one transparent region in front of the gradation.