This is a great combo set of the small wrist spikey and the finger spikey - both are strong sensory input
We like to refer to these as the ‘coriander of fidgets’ - because you’ll either love or hate it
Often used by those who experience anxiety, that pick/bite, also helpful to minimise harm as the wrist one when twisted by the opposite hand around the wrist hurts without damage.
most prefer the smaller wrist spikey , irrespective of size, as it gives stronger input. It is personal though.