Hign-concerned Chemical:NoneModel Name:For 100cc EngineOrigin:Mainland ChinaFeature: Brand new and high quality This cylinder will make your bike faster, it will accelerate faster and run more efficient This is a cylinder for a 100c motorized bicycle engine Installation only takes 4-5 minuets Color:Silver Fitment: For 100cc Motorized Bicycle Bike 1.Any questions, pls. contact us via Aliexpress message or email us.We will reply your message within 12 hours.If you do not receive our reply within 12 hours, pls. post a message again because sometimes our message system may block some emails. 2.If you are satisfied with our service, pls. kindly leave us a positive feedback and give us the Detailed Seller Rating with all 3.Our aim is to provide Top Level Customer Service, your recognition will encourage us greatly and serve you better. We strive to keep all our customers satisfy. 4.We greatly appreciate your POSITIVE feedback. Please do not leave negative feedback without asking for help. Thank you~ BD11206