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Quick demo of the S-Thunder Shocker grenades.
Very simple to use, very simple to fill. Great grenades for airsoft.
The fact that you need those red buttons to use them could be a pain, but I guess you can use duct tape or something instead. And it makes them very fast to reload, which is very nice compared to other grenades that really take a while to get reloaded.
You can get those grenades from the S Thunder website.
The small one cost 85 USD (it's the price for 2 grenades, they come by 2).
The medium one cost 58 USD.
The big one cost 60 USD.
You can also buy bags of red buttons for 18 USD (that's 100 buttons).