NEW LEGO Train Buffer (Qty 2) Coupling w/ Sealed Type 2 Magnet RC OR 9V | eBay
Old Elementary: A brief history of LEGO® magnets | New Elementary: LEGO® parts, sets and techniques
Amazon.com: LEGO Parts, Bricks, and Pieces - Black Train Parts Combo Pack (2 X Buffer Beam with Sealed Magnets and 2 X Train Wheel RC, Holder with 2 Black Train Wheels) : Toys & Games
LEGO PART 29085c01 Train Buffer Beam with Sealed Magnets [Type 3 with Closed Bottom] | Rebrickable - Build with LEGO
Train Buffer Beam with Sealed Magnets - Type 2 (flat bottom)
Train Buffer Beam with Black Train Coupling and Black Magnet Cylindrical (4022 / 2920 / 73092) : Part 4022c02 | BrickLink
LEGO Sets with Part 64424 Train Buffer Beam with Sealed Magnets
LEGO PART 64424c01 Train Buffer Beam with Sealed Magnets [Type 1] | Rebrickable - Build with LEGO
Amazon.com: LEGO Parts, Bricks, and Pieces - Black Train Parts Combo Pack (2 X Buffer Beam with Sealed Magnets and 2 X Train Wheel RC, Holder with 2 Black Train Wheels) : Toys & Games
LEGO 5303 Trains Buffers and Magnetic Couplings | BrickEconomy