Speed Stacks Competitor - White Flame w/ Black Flame Mat 12 White Flame Speed Stacks Cups with Atomic Silver Snap Tops GX Timer & GX Black Flame Mat Quick Stem with Online Stacking Instructions The only cups endorsed by the World Sport Stacking Association (WSSA) for competition. Winner of a 2018 Family Choice Award! The "Family Choice Awards" recognize the best in children's and parenting products. Now in its 21st year, the "Family Choice Award is one of the most coveted, family friendly consumer award programs in the nation.