Thera Sensory Ball is a perfect therapy ball for those who need to wake up their sensory system. Provides a pleasant massage that promotes blood circulation. Ideal for rehabilitation exercise Thera Sensory Ball is great for developing balance, tactile awareness and coordination Specifications Diameter: 65cm Ideal for use: indoors or outdoors Material: Heavy-duty burst-resistant vinyl. It can also be inflated or deflated with a bicycle pump so that the pressure can be adjusted to individual needs.