These black 8-Ball valve stem caps are sold as a pair of two caps, and are a great replacement for those boring plastic caps that came with your inner tubes.
Novelty valve caps like these are a small and inexpensive way to customize anything that uses pneumatic tubes and tires. A small touch of individual personality, and a way to say "This one is mine. There may be many like it, but this one is mine."
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Proposition 65 Warning