Four pieces are required to create a complete carton. Pricing is per piece. Panels feature fragile, handle with care and do not lay flat messages. 4 piece telescoping design provides a customized fit. 200#/ECT-32 (Edge Crush Test) - holds up to 65 lbs. Pre-printed with a collection of instructions including: "Fragile-Glass" and "Do Not Lay Flat". Meets most mailing and shipping carrier specifications. Contains a minimum of 30% recycled content. These boxes were designed to create a "custom fit" for mirrors and other glass products.