Body Mass Index Wheel Calculator. Digitally printed high resolution Full Colour & varnish directly on to the .020 White Vinyl Plastic. This makes for a top quality, long lasting wheel. Use our standard template or supply your own customized one. Ideal for Family Doctors, Pediatricians, Fitness, Health, Diet & Insurance Industries among others. Custom imprint and bleed edge included. Top wheel 4.5" dia. & Bottom wheel - 6" dia.