This is for gyms and those who want a large quantity. You are welcome to sell them at your gym. The brush head is about 6cm, slightly larger than a typical brush, making it recommended for those who want to scrub slopers and holds vigorously! A high-quality brush with approximately 14,000 boar bristles densely planted. The grip is plastic, so you don't have to worry about damaging rocks or holds. The handle is also strong and won't break easily.