Best gags for drolling

 My girlfriend and I are starting to explore our kinkier sides and are working our way into some bondage. One of the tings we want to get is a gag, I love the idea of her bound and gagged with drool running down her. Can anyone recomend some gags that are good at giving a good ammount of droll, but not too "hardcorde"

Thanks,

 ball gags are ok but iwould suggest something like this

http://www.lovehoney.co.uk/product.cfm?p=15820

Thanks for the suggestion. They do look more "extreme" do they tend to be more uncomfortable than ball and bit gags? I can imagine they encourage a lot of drooling and I suppose the added advantage is you can put things in their mouth too. I was hoping to narrow down our choices, now its just widened them!

 unfortunately there are many different gags you can get. i find i drool with a ball gag but only if im facing downwards ie my partner is doing doggy style. have you done a quick google search for drooling gags?