PotteryVille Red glass magic crystal ball style knob for your kitchen and bathroom cabinets and drawers. Made of glass. These fun glass knobs add a touch of design to your household cabinets, drawers or dressers. Cabinet knobs are approximately 0.7" in diameter. Delivery time is normally 5 to 7 business days. If the item is out of stock, delivery will take 4 to 5 weeks.