GT Performance spoke, hub and horn button materials are primarily high grade aluminum, stainless steel or chrome. We recommend a non-abrasive premium polish. Apply with a soft cloth and buff out with a micro fiber cloth. Wood rims are clear coated and should be cleaned using a damp cloth, leather rims should be periodically clean using a name brand leather cleaner and foam grips can be cleaned and protected using a quality vinyl protector (such as 303 protectant).