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Speed Stacks Inc
https://www.speedstacks.com/home/
Each team divides into pairs for doubles. One team competes while the other team judges. Each doubles team gets 2 warm ups and then three official attempts at a stack of their choice.
NEED CUPS?
Speed Stacks Store - https://www.speedstacks.com/store/retail/
Or on Amazon:
Competitor: https://www.amazon.com/dp/B00LG3C292
Set: https://www.amazon.com/dp/B008E53AFK
StackMat: https://www.amazon.com/dp/B0182KR2LO
G4 Timer: https://www.amazon.com/dp/B00ADUXF5E
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7.00!!! OMG!!! NEW PB! OMG!! OMG!!! SO CLOSE TO SIX!! OOMMGG!!!