Seastone Bombs

Weapon name: Seastone bombs
Description: Black and round , though there is a red “x” mark in red located on the middle of the round ball.
Weapon special abilities: It will explode on impact/ weight of atleast ten pounds of force. When exploded it will release a powdered substance of sea stone, which is usually used against Devil Fruit users. It can also be used on normal people in the extent the powder might go into their eyes and cause slight pain and irritation.Some effects on everyone will be more coughing, sneezing and watery eyes. On DF users, they may or may not drop down to the ground for a short period of time or untill their body recovers. Range 4 m. diameter
History: Recently made by the marine scientists to try and fight off the pirate nuisance.

Seastone bombs?
Uh, you know seastone is the stuff that's like... deep, deep in the sea, and super rare?
Seriously, making bombs out of it? Then again, this is the marine we're talking about... Still, seems like a waste...
How much seastone powder would be in one of those?

150 grains, isn't that big and will only go to a small length. 8 m radius.

Hmmm.... that's still pretty much if you ask me... Why don't you make them, like... more hand grenade like?
Seriously, it's the same problem I have with those exploding vests: if you have too much of it, it becomes overpowered and cheap as hell. I mean, I don't have anything against that idea, just trying to prevent that.

Know any good limitations I can put on it then?

How about making them smaller, not like bombs, so that they'll have a.. let's say two to three meter radius they affect. Since it's seastone powder, it shouldn't be as effective as an actual seastone, but still a huge nuisance to devilfruit users since it would be damn hard to get rid of....
Yeah, I guess that would be approvable to me.

Edited

Now, if you could make it a little more detailed, I'll approve it. For example, include reach, or how much it affects df users.

Done

APPROVED