Da/Pro Rubber, Inc. offers custom natural rubber, synthetic rubber and silicone o-rings in a variety of sizes. We offer solutions for your rubber o-ring seals, with custom compounds that will work for your specific applications. We can mold rubber o-rings as small as 0.051 inches O.D. (1.30 mm) to as large as 20 inches O.D. (508mm). Damage to the O-ring's surface is eliminated because secondary flash removal operations are seldom required. We offer a list of current rubber o-ring seals (mold sizes already available). Contact us to order or get information on other sizes.