The brush is made of 100% natural rubber, which is non-toxic and free of PAHs (harmful substances that can cause cancer). The material complies with the requirements of the European REACH regulation. Completely safe for your horse. The brush is flexible, allowing for excellent yielding for optimal ease of use. Brushing can be done in both circular and straight strokes. Because the brush is so soft, the Loose Hair Groomer is perfect for horses with even the most sensitive skin.