Color Selector Prefab/sprite

HI there sorry to post up a topic but i couldnt find any info on this specific colour selector.
basically just want to change the main image of color picker. i try replace the prefab and other things but no luck. still a noob lol


public MousePainter PainterScript;
public Camera refCamera;
public GameObject selectorImage, outerCursor, innerCursor;
public SpriteRenderer finalColorSprite;

Where did you get the prefab? Are there other assets associated with it? Have you looked at the shader file yet?