Sorry but it is 3/4" and red.

I did not like the bounce of the original plastic ball when i played one at a show. I was using a steel ball for a while but not much time to react and change lanes, the plastic had a lot of bounce almost to much. My solution was to get a 3/4" glass shooter marble. I like it.

On a side note. One of the bigger sellers does sell the original ball but i can not remember whom.

Cannon issues could very well just need the microswitch replaced they do have limited switch life. When one of my cannons acted goofy i just replaced micro and no problem since.

I had a couple of the long straight arm ones and just formed my own if i remember correctly. i would think, Marco, Pinball Life, PBR would have the correct one.