Synthetic Wool - The brush is both made of dense and fluffy synthetic wool, metal-free,scratch free,no need to worry about the wheel brush damaging the cleaning part. Also it can absorb dirty water quickly,not easy to rebound dirty water then traditional PP material brush. Warm Tips: Please use the side of the brush to clean your car wheel, please do not use the top of the brush to clean.,360° Flexible & More Cleaning Diameter to 0.85"-2.17" : The brush both both are flexible with 360 arbitrary bending. The 15" Brush can reach to 0.85" minimum cleaning diameter,16.5" Brush can reach to 1.3" minimum cleaning diameter, perfect for cleaning between the wheel spokes, inside of the wheel, alloy wheel slots and any other tough to reach areas and gaps.,3 Size Detailing Brush - We provide 3 different size brush for interior & exterior various areas to meet your diverse needs, both wet and dry use, for air vents,car duster,,dashboard,leather,seats,wheels,lug nuts,engine compartment,exhaust tips, bumpers,fender and other small spots,for car,truck,motorcycl,bicycle and more.,Stiff Bristles and Non-Slip Tire Brush - The black brush is made of stiff bristle, easy to clean the heavy duty on tire such as road grime, scrub tire / carpet / floor matt. Please do not use this brush to clean surfaces that are easily damaged by friction, such as car surfaces and seats, to avoid damaging the car paint and seats.,Multi-Purpose Use - Cars, trucks, motorcycles, bicycles, boats, wheels, rims, spokes, grills, engine bays, exhaust tips, bumpers, vents, and much more.