Yakima Control Towers - Pairs Quickest on/off for a hassle-free installation and removal Design creates solid engagement for vehicles with factory tracks, mounting points or Permanent Installation Vehicle specific Landing Pads by Yakima required to ensure a custom fit to your vehicle (sold separately) Sold in sets of 4. Also sold in pairs and requires Yakima crossbars (sold separately) Love it 'Till You Leave It Limited Lifetime Warranty.