Wow it's been a while since I was last on here!! I don't really know how to describe them, they're like two silicone balls that you put inside you that jiggle around because inside those there are some metal balls - all feels nice and they strenghten your pelvic floor muscles at the same time. I think guys can use them too for a bit of bottom play!
Anyway I think I did a bad job of explaining them, they're on sexgear here:
http://sexgear.co.nz/sub-category.aspx?id=109&page=1 if you want to take a look - I blame sleep deprivation!