Plastic Arbor Shims are color coded.
Press Release Summary:

Original Press Release:
Finally, Plastic Color Coded Arbor Shims
Precision Brand Products, Inc. introduces new Plastic Arbor Shims for light to medium duty spacing. Shim identification is easy because the color tells you the thickness!
All shims are non-conductive, non-marring, non-magnetic. These Plastic Arbor Shims also resist oil and corrosion. Ideal for fast accurate spacing of milling cutters, gang cutters, saws and grinding tools. Material experiences minimal compression during use.
The .001" to .005" thick shims are made from a polyester material; the .0075" to .030" shims are made from a vinyl material. Plastic Arbor Shims are offered in thirteen different thicknesses, ranging from .001" to .030", in twelve I.D. and O.D. combinations. I.D. sizes start at 3/8" and go to 2", O.D. sizes start at 5/8" and go to 2-3/4". Larger and thicker shims are also available on special order.
The shims are sold in individual sizes; 10 pieces per package or in convenient assortments.
Precision Brand® Plastic Arbor Shims are sold through industrial distributors worldwide. For more information contact Precision Brand Products, Inc, 2250 Curtiss Street, Downers Grove, Illinois 60515, Phone: (630) 969-7200, Fax: (630) 969-0310, Web://www.precisionbrand.com E-Mail: precisionbrand@pbrand.com