Thanks buddy, those were actually very necessary to create a deterrent against israel to defend our people. And they fired about 7-9 during the last war. And the point isn't to do large scale damage like some people claim. It's to create a deterrent that anytime israel attacks they can target tel aviv here.
And they have from 100-500 of them in the Strip. They used to smuggle one a day when the tunnels were open. Now they use technology Iran gave to build some here, it's known as the M-75. Which is very similar.
Hamas also has very few quantities of Zelzal and the old version of the Shahab too with about 120km in range.
It's difficult for smuggling now, but after the Egyptian army pulls out of Sinai I'm sure it will resume and Iran still does arm IJ and Hamas here.