Weight adjustment inner mold for front tires made by ZH Racing, commonly used in Hang-On Racers. Made with a 3D printer. The product in the first photo is what you will receive. (The screws are now black from this batch.) For those currently using ZH inner molds, it's designed for easy transition. "The diameter is made to be close to the ZH inner mold." Weight can be adjusted by the number of ball weights installed. As shown in the 2nd, 3rd, and 4th photos, "10.0g with 0 weights" and "15.7g with 12 weights" allowing adjustment both above and below the "12.0g of the ZH inner mold." (12 ball weights are included, but you can add more. You probably won't need to use more than that.) Also, as shown in the 5th photo, ball weights can also be installed in the "inner ring," allowing you to create "inner molds with the same tire weight but different gyro effects." (This avoids changes in front-rear weight depending on the number of balls.) The dimensions of the wheel and inner mold are appropriate, so "tires can be set without adhesive." In other words, you can change the settings by swapping the balls without having multiple tires and wheels. (Push them in with a scale or a minus screwdriver as shown in the 7th photo. Set the tire in a stretched state, so there may be a gap of about 0.5mm as shown in the 8th photo, but it has not come off during driving. If you are concerned about using a high-power motor, please use adhesive.) After a year of considering the shape, 3D printer used, and materials, I have created something that meets the required conditions. I hope you will give it a try. Shipping is via "regular mail." Immediate 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. (The price is set excluding the margin for direct sales.) Please understand. Thank you. Type...Radio Control