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O-Ring supplies & kits are ordered by size in this section. They are smallest to largest which should give you a better idea of the sizes you will be working with in each of the kits.
5mm O-Rings Random Mix - Pkg of 100
6mm Rubber O-Rings (ID: 2.6mm) Random Mix - Choose palette
7.25mm Rubber O-Ring Hand Picked Mix (ID: 3.7mm) - 10 colors included
15mm Rubber O-Rings Rainbow Hand Picked Mix (ID: 10mm) 6 Color Rainbow Mix