Inner mold for ZH Racing rear tires, commonly used in Hang-On Racers. This is the "B (Standard)" type. Made with a 3D printer. The product in the first photo is what will be sent. Measured ZH rear tires and made to fit perfectly inside. *Also available are "A type for high stability" and "C type for easy leaning" in separate listings. I think it's best to start with the basic B type. Weight is "16.6g for the inner mold only" and about "62g including tire and wheel". The dimensions of the wheel and inner mold are appropriate, so "you can set the tire without gluing" (see photo 5). (If you are using a high-power motor and feel uneasy, please glue it.) After a year of making and testing, changing the shape and testing again, I have created a product that roughly meets the required conditions. I hope you will try it. Shipping is via "regular mail". Instant purchase is OK without questions. By the way, I am the aforementioned "Chevron Models". Made with a 3D printer (layered in 0.1mm increments for accuracy) and assembled and finished by hand, so I can't make many. Therefore, it cannot be distributed through wholesalers or retailers like our other products. (We have set the price excluding the markup for direct sales.) Please understand. Thank you. Type...Radio Control