This Heavy Duty - Hard Plastic - Reusable Water Circulating Surgical Board fits in a standard U-Frame Stereotaxic. Used with any of the TP Gaymar Pumps, HTP-500 Adriot Water Circulating Temperature Pumps, or iP003-07 Hot/Cold ThermoZone Pumps. Measuring 4" x 10", Sold 1 Each.