Speed Stacks Minis Set of Minis with Quick Stem Minis will test your stacking skills and provide a fine motor skill challenge. Cups are 1 1/2" tall 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.