Tim Grounds Half Breed Dhampir Goose Calls are the ultimate short reed style goose call on the market today. The Half Breed Goose Calls are made of durable ABS plastic with a great sound. They are the top choice of professional guides. These Goose Calls are hand tuned by Tim Grounds himself. Leave no stone unturned, or should we say they will drop like stones with the Time Ground Half Breed Goose Call. All Tim Grounds calls are guaranteed to be properly tuned, free of material defects and ready for use.