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Sterile disposable patented covers sewn of medically bleached knitted cotton fabric with worked-in X-ray thread and with bands. The bands are used to fix the covers at the wound hook. The wound hook covers are put directly on the sterile wound hooks. Owing to a counting card on the inner packaging and a second counting card on the outer packaging, the counting may be checked quickly and safely. The double sterile packaging guarantees the sterility of the set until it is used.