How Does It Work?

FLUTTER PITCH INSTRUCTIONS

 
Place middle finger in CUPBALL

CURVE INSTRUCTIONS

 
Place forefinger over side of CUPBALL, open end, thumb on bottom

SCREWBALL INSTRUCTIONS

 
Grasp CUPBALL along side, forefinger near closed end

DOUBLE CURVE INSTRUCTIONS

 
Grasp CUPBALL along side, forefinger near open end

CHANGE UP INSTRUCTIONS

 
Place fore and middle fingers on edge of CUPBALL open end, thumb on bottom