Lose the key piece to your Magslider? Lid? We've got you. If you've got the MagSlider? Lid, but need the magical magnet piece, you've come to the right place. After all, the most important part of the MagSlider? Lid is, well, the magnet slider. Fits all three of the MagSlider? Lid sizes, but isn't compatible with the Stronghold Lid.