DESIGNER: Jon Keegan MATERIAL: 6061 Aluminum, Ball Bearings SIZE: 1.97" x 3" Tumbler draws inspiration from Wil Strijbo's classic cylinder puzzle. This puzzle contains unique internal geometries and adds extra difficulty by introducing a rotating bottom end cap. Added slots and indicating marks are included to aid the puzzling experience. "A different twist on a classic by Wil Strijbos" Objectives: Use indicating marks to find puzzle alignment. Release tumblers into the body of the puzzle. Release tumbler end cap. Twist-turn-shake-solve-learn. No external tools required. No force required. All movements are gravity-assisted." A video review by Mr. Puzzle can be found here (WARNING: Video contains solution spoilers) Handling Metal Puzzles While all metals tarnish over time, residual oil and salt from handling speeds up the process and leaves fingerprints. An individually packaged metal cleansing cloth is included with each metal puzzle sold on Cubicdissection. Metal Puzzle Polishing Kits which contain a larger cleansing cloth and microfiber polishing towel are also available .