Hi,for the mars medical challenge i made a brush. This brush has a very smooth handle the handle in a rectangle with filleted corners. This brush has a 20x15 bristles and it gets your hair looking great in seconds. I tested it out myself and it makes my hair go from zero to hero in seconds. This comb might look weak but it gets the job done. The comb works best when your hair is wet. The combs handle is very smooth and soft and it is extremely comfortable. The bristles height is about 7/16 inch and there are 300 bristles in all causing your hair to look great in a short amount of time.