The Hot Tools Pro Signature large replacement brush head is designed with all of the same features you love to keep crafting salon-quality blowouts anywhere, anytime. The H7 Oval design in a new size (30% smaller vs original size) allows you to get closer to the root and craft gorgeous one-step blowouts from root to tip. The smooth flow bristle and vent pattern provides fast drying, while the therma glide ceramic coating works to create even heat distribution and add healthy-looking shine. Mixed boartech bristles with silk glide effortlessly work through hair to gently detangle and grip for smooth results. The bristles are also charcoal-infused, great for styling freshly washed hair or helping to refresh 2nd-day hair. The cool tip provides styling control and added protection. The attachment easily fits with any of the one-step blowout detachable dryer interchangeable handled. How-to-use: 1) first make sure your one-step blowout unit is off, unplugged and fully cool. 2) align your new attachment piece with the handle top and insert with a slight twist to the left until you hear a click. 3) Enjoy gorgeous blowouts!