Specially designed 27cm wiggle seats for young children- help calm and focus those in early primary school and preschool who have a hard time sitting still. Allow children to quietly move while working enabling them to be more productive. Flexible child size nubs on one side and small bumps on the other give a choice for just the right amount of tactile stimulation. Ergonomic disc causes the body to stabilize itself- improving posture. Designed for young kids unlike larger cushions and balance discs. Effective on chairs, benches or directly on floors.