Note! 1. Because this product is measured and produced manually. There may be errors, and the size error will not be greater than 2cm. Please understand! 2. 6In (150mm) brush head, because the bristles are long and packed in separate bags, the bristles may gather together. It does not affect the use. Please understand! 3. During the cleaning process, when you find that the length of the rod is too long, please remove the unnecessary part of the rod in time, otherwise the long rod may cause several rods to be entangled! ?Warning!? 1. When the rod needs to be bent during use. Please use extremely slow speed to turn, and use it in a continuous way! Do not turn fast when bending, because fast turning will generate a lot of heat at the turning part and make it break! 2. Only rotate the brush/rod assembly clockwise. The opposite direction may cause the brush head or rod to separate in the pipe. Never force the brush/rod assembly through the pipe! If it gets stuck, pull the assembly a few inches away from the narrow area (still rotating clockwise), and then push it forward slowly.