It's a 10 Miracle Round Brush 33mm

A round brush ideal for shoulder-length and shorter hair that provides lifts at the root and leaves your hair with soft body. The bristles grip and guide without slipping while the copper-coated, vented barrel smooths and speeds up blow-dry time so styles hold their shape, and the handle gives steady control. 1. You can choose from four sizes based on your hair length. 2. Copper powder is added to help hair condition. 3. Unlike conventional hot thermal brush, it is made of porcupine bristles type to make your hair more shiny. 4. Because of the space between the head part injection and the barrel, heat is circulated between the spaces when using the brush, which allows for quick transfer and retention of heat. 5. It is assembled with a double injection handle, so it is slippery and has a good grip when using a brush.