This shuriken is based off of the weapon used by the Kakashi Hatake figure in the Narutop 100 series of figurines, with an added whole in the middle to better reflect real shuriken and the shape of Kakashi's Mangekyo Sharingan. Kakashi Mask for scale.

Small Shuriken: https://makerworld.com/en/models/484254#profileId-396588

Showcase and Build instructions shown below, respectively.