This is A set of four special effects exploding Shurikens or throwing stars, they have a recessed area for small squib explosives or whatever, you can see burnt areas from being used on set, these were used in season four where Citizen 8's droid worker bots are tearing up the cargo hold on the Andromeda and when they open the door to throw in Harpers EMP device a few of these come flying out and a couple bit the walls and one gets stuck in Rommies Back and she tries to reach it while panicking telling Harper to pull it out, pull it out after one of them stuck in the wall explodes these are the ones that had the pyro and explodes as can be see. On them in the pictures there are burn marks from actually exploding
