Brianna has also sourced some toys and baby products that she intends to sell through a mail drop.
The Arthurs, who live 12 minutes from Marton via Turakina Valley Rd, were introduced to cup stacking in 2009, when fellow home-schooled friends from Rotorua visited in the Christmas holidays and showed them how it was done.
Brianna said they learnt the skill step-by-step, eventually mastering the stacking routine used in competitive sport stacking.
It was then a case of practising, attempting to improve on the time it took to complete the standard cycle stack. The world record is 5.93s.
The Black Stacks' team manager is also from Wanganui. Teacher Karyn Slade has been involved with sport stacking since it was introduced at St Mary's School two years ago.
The others in the team are all school pupils from the Wellington region.
Sponsors
Any potential sponsors can contact Speed Stacks (NZ) 06 326-9535 or Richard Lloyd 021 737 806