G5 Speed Stacks Cubing BundleG5 Speed Stacks Cubing Bundle The WCA Standard The Professional Competition Kit The G5 (Generation 5) series introduced critical ergonomic and mechanical changes to prevent accidental resetsthe "nightmare" of competitive cubing. This bundle provides everything needed to replicate a tournament environment at home. In Australia, this kit is frequently used at official WCA events in Melbourne, Sydney, and Brisbane, making it the essential training tool