Speed Stacks Set - Black Flame (click for more colors) 12 Black Flame Speed Stacks Cups with Sports on Fire Snap Tops Quick Stem Online Stacking Instructions WSSA Approved - 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.