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<http://schema.org/description>
"Protect yourself from flats with Bontrager Thorn-Resistant tubes. Asymmetric design uses thicker rubber on the tread side and thinner rubber elsewhere, which saves weight while maximizing puncture..."
<https://www.maddogcycles.com/product/bontrager-thorn-resistant-presta-valve-bicycle-tube-179514-1.htm>