Gently and effectively cleans with scratch-free natural boar hair. Bristles measure 2.5" to easily clean inside hard to reach areas such as lug nuts and other hard to reach crevices. Boar hair is naturally resistant to aggressive cleaners for long life. Bristles set in durable plastic ferrule that will not crack and ensures bristles will not fall out. Resin handle prevents mildew and staining. Not constructed with any metal components that can corrode.