Material: Made of stainless steel with well-polished surfaces and edges. The 7 colored cups are made of ABS plastic, durable enough to resist daily scratches and discoloration, and will last a long time. One Size Fits Most: These ring hooks come in a universal size and fit most standard-sized pegboards, including 1/8 inch, 3/16 inch, and 1/4 inch hole diameters on pegboards, compatible with metal and non-metal pegboards. Easy to Use: 7 colors of matching cups and 7 ring hooks, so you don't need to buy additional accessories. Can be disassembled and combined at any time, convenient to install and remove. Wide Application: The pegboard bins with rings allow you to store art and craft supplies, or other small items, hardware, hand tools and more, perfect for organizing your workbench, shop, craft room, basement or garage.