These were items that could be purchased from GSC that offered a different way of displaying your Nendoroids that are designed to use a peg-in-the-back style stand.
Each stand came with a "base" piece (suction cup) with an attached arm and a peg of the same matching color. Originally they came with one peg for Nendoroids and one for Nendoroid Petites (you could swap out the peg depending on what figure you wanted to display).
White, Pink, and Mint (Green) were the original colors available. Orange was made available the following year. When purchasing select the color and condition you would like to buy.
To read about the development of this product, http://ameblo.jp/blog-shinsotsu2012/
We are not responsible for damage to your figures if the suction cup fails, sorry!
https://www.goodsmile.info/en/product/3682/Nendoroid+More+Suction+Stands+White+Pink+Mint.html
https://www.goodsmile.info/en/product/3818/Nendoroid+More+Suction+Stand+Orange.html