9 unopened parts, plus bonus tires. These items have been stored at home for a long time. Please refrain from purchasing if you are sensitive to such matters. I am not knowledgeable about this, so I cannot answer questions related to Mini 4WD. This is a parts set for TAMIYA's 4wd Mini Racer, including basic tune-up parts for the MA chassis and double aluminum rollers. - Brand: TAMIYA - Product Name: 4wd Mini Racer - Part Name: Double Aluminum Rollers (13-12mm) - Part Name: Basic Tune-Up Parts Set for MA Chassis - Quantity: Multiple parts set, plus bonus tires Thank you for looking.