Here, I just took them. Sorry but I don't have any pictures of them in use. I shot a common CR2032 motherboard battery for size reference.
Some advice:
It's of the UTMOST importance that the beads are free to move along the string, I know this because:
They CAN move and tangle inside your bladder.
They CAN move a lot when you cum or pee with them inside you
So, I had them with a double string, for extra strenght, the first times I was afraid the string would break when I pulled from it, and they having a narrow channel (hole, orifice, don't know the right word for it, the part where the string comes through) weren't all able to move freely (the orifice is not exactly the same diameter in all, some are narrower and hence they just stood put in place). The string doesn't break, I've tested it unscientifically and it takes a lot of strength for it to break.
After I peed (peeing with something in your prostate is delicious, besides, if you're sounding you should already have a lot of urine inside you, more on that later), well, they positioned themselves on the dreaded two column formation, I think at least 8 of them were in that fashion in the widest part of the urethra (about and below the point where the penis joins with the scrotum) and it was impossible to take them out! I can't stretch my urethra, in its narrowest part, that much, nor do I want to, and that part is preciselly the exit of the shaft.