39½ inch-diameter empty ellipsoidal-shaped tank crafted from two joined titanium alloy hemispheres, manufactured by Sargent Industries for NASA, ca. 1970. Red identifying labels, as well as one paper label. 

Two such tanks were located in each reaction control quadrant, with one containing fuel and another an oxidizer. When brought together, they ignited, causing thrust which was used to steer the spaceship. This particular tank was sent as a gift from the Vice President of Sargent Industries to be used in a student's project. In a letter sent to the student, the Vice President explains the manufacturing process and use of the tank, noting that it's normal selling price was $3000.