The Exibit-1 wine racking system is a versatile and expandable wine storage system that allows you to mount the majority of wine bottle types in any space and any surface. The wine "saddle" mounts directly to any wall surface with a screw driver and a few screws. The hooks are made of a durable plastic called polypropylene. Durable and strong enough to hold 10x the weight of a bottle! One order includes 12 saddles - to mount 6 bottles.