This is the "A (Mild)" type inner mold for rear tires made by ZH Racing, commonly used with hang-on racers. It is made with a 3D printer. The product you will receive is shown in the first photo. (The exploded view in the third photo uses a B type (red) for illustration.) *The screws have changed from silver in the photo to black. It is made with a clearance of a few tenths of a millimeter from the ZH rear tire. Compared to type B, it has a slightly flatter profile, making it more stable. If you have tried the "B inner" and want a little more stability, please try this "A" type. The weight is approximately "16.2g for the inner mold only" and "62g including the tire and wheel." The dimensions of the wheel and inner mold are optimized, so "the tire can be set without adhesive" (Photo 4). (If you are concerned with a high-power motor, please use adhesive.) After a year of repeated production, testing, and shape modifications, we have developed a product that meets the required conditions. We hope you will give it a try. Shipping will be via "standard mail." Immediate purchase without questions is welcome. By the way, I am the aforementioned "Chevron Models." As it is made with a 3D printer (0.1mm layer height for precision) and assembled/finished by hand, we cannot produce large quantities. Therefore, unlike our other products, we cannot distribute through wholesalers or retailers. (The pricing is set to exclude margins for wholesale and retail, assuming direct sales.) We appreciate your understanding. Thank you. Type: Radio-controlled car