Come and see our amazing products. The cup holder is made of ABS plastic and slip resistant rubber, which are durable and environmentally friendly materials, to make sure the drink doesn't spill over during use. Universal cup holder fits for most scene, as wheelchair, stroller, bike, bicycle, walker, scooter, boat, kayak, shopping cart, Golf cart, motorcycle, beach chair, etc. The cup holder has rubber pad that shrinks, it is suitable for containers less than 3.5" in diameter, fits for most bottle, drink, coffee mug, beverage cups, etc, avoid drink spill over. The clamp can be on rods which diameter between 0.9-1.7". Pls confirm further with us if any query about packing info, inventory status and time schedule.