This is a type of 2 piece, adjustable Nendoroid stand that has not been included with any released Nendoroid. It is being exclusively sold seperately as a different option for Nendoroid support. It functions without a base or pedestal piece and instead has a special arm that acts to prop the Nendoroid up by using a traditional peg piece in the back. This will only work for standard Nendoroids that have a hole in their back (mainly those numbered 300 or later) and depending on the style of hair might not be ideal for all Nendoroids. The arm is adjustable to help fit it under long hair pieces and to adjust for the different heights of the holes in the back of Nendoroids. This stand is not designed for Nendoroid Dolls because when they stand they are too tall to use it, but it might be useful for posing them in a seated position.
These are packaged by GSC as a three pack and we are selling them as an unopened three pack or individually.
https://www.goodsmile.info/en/product/9932/Nendoroid+Easel+Stand.html