Abstract: An apparatus and method of producing an elongate calibrated extrusion of a formable material. The formable material most suitably comprises a thermoplastics polymer having an outer skin (94) and a foamed core (91). It may be formed using an extrusion apparatus (100) having an extruder (101) and a co-extrusion die (104) which delivers the extrudate between opposed sizing conveyors (106). These travel at a speed suitable to allow them to continuously take up the flowable extrudate. The flowable extrudate is caused to adhere sufficiently to the surface of the sizing conveyers in order to cause the extrudate to maintain its shape. The extrudate is detached from the recirculating sizing conveyors after it has solidified sufficiently to exhibit the desire dimensional accuracy. Produce exemplified includes relatively high Young's Modulus composite product fabricated into materials handling pallets.