It has come to our attention that copies of our photos and descriptions are being used. Items being sold at prices that don't even cover the cost of materials (e.g., multiple items for 1,000 yen) are likely counterfeit products. We offer no guarantee regarding the materials or durability of the aforementioned items. This product cannot be used in conjunction with the development kit. It is a standalone product. This joint allows you to easily convert an Obitsu 11 body into an Obitsuroid simply by inserting it into the neck without any modifications. The neck is securely fixed and stable. The neck can be turned left and right, but it does not have the ability to tilt or nod. If you desire those features, please use the kit. You will receive two items: the joint and a washer, 1 of each, for a total of 2 sets. Place the washer in the indentation at the bottom, and then attach the joint. Please note that the head in the reference photos is not included. This product is not compatible with Nendoroids, older models before number 300, and those with protrusions inside the head, such as Levi (number 390) and Shimakaze (number 371). We have also received reports of incompatibility with numbers 365, 418, 1401, 1541, and 1550. In addition, there seem to be other models that are sometimes incompatible. Please check the inside of the head to see if there are any protrusions. The product is usually shown in the third photo. It fits perfectly.