This IAAF certified training hurdle is the best available. Round upright chrome plates steel tube with sliding aluminum tubular powder coated pipes with push buttons to raise and lower the board to the desired height adjustment. Height adjustable at 30", 33", 36", 39" and 42". Double ribbed lightweight fiberboard. Features easy detachment for stacking and storage in lesser space and for convenient shipment. Features specially designed ABS plastic molding system for easy slip-in adjustment of gate board.