Individual BirdieBall in ClamShell w/Instructions Golf Training

I practice in my yard now. Saves driving range visits. You can't put it, but chipping, pitching, etc. let's you hit full shots and practice. Pretty rugged. Slices slice, hooks draw, straight is straight. Only go about 40 yards.I have an acre of land and plan to put in a 9 hole course using 5 gallon buckets as holes.