278 safe to say i would spend every single penny on these they are not super hot i would say more warm to the touch and dont have velcro like some other rulers so it gives you a super bouncy, voluminous curl with less frizz & added shine. There’s two different size barrels and they all come with the clips. I would say I left them in for probably around 20 to 30 minutes and I cannot get over those results!!! ✨🫶 linked in my LTKClipsFashion & Beauty