The Lian-Li O11D Mini-1X PCI-E 3.0 riser kit in black is a vertical graphics card mounting accessory built specifically for the Lian-Li PC-O11 Dynamic Mini and O11 Air Mini cases, letting a GPU be installed vertically instead of the standard horizontal expansion-slot orientation — a popular way to display a graphics card's cooler shroud and RGB lighting directly through a tempered-glass side panel, which both of these O11-family cases are built around. The kit includes a 3-slot rear I/O bracket panel plus a 200mm PCI-Express extension cable rated for PCIe 3.0 signaling, giving the physical reach needed to route a card from the motherboard's PCIe slot up to the vertical mounting position without straining the cable or risking a poor connection. Because this is a genuine Lian-Li accessory purpose-built for these two specific case models, it's a safer, better-fitting choice than a generic third-party riser kit — correct bracket dimensions, correct cable length, and confirmed compatibility with the case's own vertical mounting points, rather than an aftermarket kit of uncertain fit.