Wear-resistant Thicker wheel design The auxiliary wheels have been carefully thickened to make them more wear-resistant, non-slip and quiet, making them an ideal gift for novice drivers High quality High quality ABS wheels and high quality steel mounting arms Our support arms for support wheels have a thickness of 3 0 mm For beginners, this means more security and stability Non-slip and quiet Our exercise bikes are made of high quality metal, plastic and rubber They have the function of being non-slip and quiet, so your child can be safer and smoother when driving without worry How to use the packaging the package contains (2 shoulder screws, 2 washers, 2 lock nuts, 2 washers, 1 cl) You can choose other height adjustment options so that the trainer can be set up quickly and easily Install it on your bike Universal and adjustable The stabilizers fit the thumb of the bike from 12 14 16 18\20 with a rearward pointing horizontal fork end, but are not suitable for people with semi-horizontal or vertical dropouts Cannot be installed on bikes with derailleurs