Booster Cylinders are DLC Cylinder items in Xenoblade Chronicles 2. They allow the player to salvage Boosters at Lascham Island.
Booster Cylinders can be obtained from Seesaw, who is first encountered at Torika Alley in Fonsa Myma during the DLC quest Sunken Boosters. Initially he can sell the party the Booster Cylinders that he crafts from one Silver Cylinder, one Zigzag Shaft and two Locust Springs. Upon completion of this quest, he can make more Booster Cylinders at any time.