From Paart Budo Buki by buki stolar
Here is new pics of my Hira rubber shuriken'sto satisfy everyone's choice, it is possible to get them in several thicknesses(size is also possible to change),
my standard 4 mm thick are enough if throw them on your Uke, but if you do certain techniques of hitting or stabbing with Shuriken then you need something thicker, such as 6 to 6.5 mm thick, this thicker are also good for longer distance or more realistic feeling evasion of shuriken flying towards you, perhaps even metal but blunt.
My recommendation is always, get yourself a different (if not size) thickness for all types of training, only one species is not enough.
so here they are,
