Ergonomic handle design.Total length is 5.9inch. The bristles diameter is 0.59inch. Best for chihuahuas ,small dogs(under 10 lb) and cats. 360 degree soft bristles brush teeth from any angle.The bristles covering 360-degree at the end it goes into the cats mouth means that even if the cats move around or chewing,so long as you get the toothbrush into the cats mouth it's likely to have contact with you somewhere. It works very well .Help you to clean your pets teeth more smoothly and easier than a normal shaped brush. Notice: Put the toothbrush away from your pet when not in use. Always supervise your pet when using this products. Discard once damaged.Wash and dry after each use.