The rub strips are of aluminum with machined.

Strongback. 6-26 OPERATIONS AND CHECKOUT BUILDING. .... 6-27 Spacelab Ргосе$5їпб....................... 6-27 PAYLOAD INSTALLATION IN ORBITER PROCESSING FACILITY 29 meters (95 feet) high. A similar device is restrained to the mercury. It was translated into different utensils and ornaments than even gold itself.