Compatible only with the T3 Switch Kit Base. Meet the multitasking styling kit that’s as versatile as you. The T3 Switch Kit Bestsellers Set is the ultimate fan-favorite, featuring the T3 Switch Kit Base and 5 interchangeable barrels for curls and waves ranging from tight and bouncy to big and bold. An intuitive Twist & Switch design makes swapping barrels a breeze, and T3 Rapid HeatIQ® technology ensures advanced heat precision across 9 temperature settings for lasting results in one smooth pass. Endless looks. No rulebook.