As some will already know, I am a shooter of glass marbles - simple reason, they're cheap and easy to get hold of, ! But ............
........ recently, I've been shooting much more often, but not getting much to show for it. I've noticed the marbles often spin off to one side or dip very quickly, and are generally quite unpredictable. So, I've pushed the boat out and ordered a couple of hundred 9.5mm steel bearings (cheap as chips !) to go with my nice new Dankung tube-set.
Just out of interest, I weighed them on the digital kitchen scales. the marbles weigh in at 5 grammes, the bear