In 2371, when the USS Voyager was pulled into the Delta Quadrant by the Caretaker, Captain Janeway ordered that the magnetic constrictors be locked down, in order to avert a warp core breach. (VOY: "Caretaker") The prop used measures approx. 18 X 6.5 inches diameter and was later re-used as an EPS relay in the fifth season episode "Relativity" . It was sold off on the It's A Wrap! sale and auction on eBay. [1] In 2372, B'Elanna Torres destroyed the self-guided missile Dreadnought by burning through the magnetic constrictor casing of its warp core with her phaser. (VOY: "Dreadnought")