Mounts easily on all window types. Strong plastic holds up to 12 oz. securely. Custom Accessories, the leader in Automotive Aftermarket Accessories, is a"One-Stop-Shop" for ALL your Automotive needs. From Interior Accessories, Exterior Accessories, Car Care, Steering Wheels Covers, Compasses, Tire Gauges, Air Compressors, Car Organization, Car Comfort, and countless others CUSTOM ACCESSORIES has it all.