A little while ago, but:
Richardson Shiva Phthalo green oil paint, for a challenge I never finished, their "transparant marble white", to try it, and 2 brushes: a blick masterstroke red sable 0, and a grumbaucher black diamond #1 flat.
The sable was supposed to replace my well used tiny filbert, which you can see in the pic, but is a bit too small. It has a great edge, though I haven't used it enough to tell how well it will hold.
The grumbaucher was to try to find a natural bristle brush that will stay firm even in acrylic, which it certainly does, a bit too well. I really like how it feels (except for the weird sticky handle ) but I don't think I'm good enough to use it the way it wants to be.
The Shiva transparant marble is oily and extremely weak, like pure zinc in acrylic. And it's in safflower oil, which I didn't catch when I bought it, so I can imagine it taking approximately 1,500 years to dry.