Due to State and Federal Law, we sell Syringes and Needles only to the Medical Facilities. resiliency and long wear from a specialized synthetic rubber * Deep tread provides good patient comfort and stability by allowing regular heel-toe walking * Center slot permits easy and secure application * Curved surface and tread ensure comfort and safety for active patients * 4.75" across the top * 3.5" on the bottom part that touches the ground * 1.5" high