sunringle sun rhyno lite 20" 36 holes black rim w/silver sides, schrader valve sunringle sun rhyno lite bmx, mountain, and tandem rims. features: pinned abt: advanced brake track, rim sidewalls are brushed for improved braking performance triple-box construction th: triple hollow feature "abt" brushed brake tracks for consistent braking made out of 6061-t6 aluminum