I LOVE Eqyss products, especially their MicroTek products and Survivor Detangler and Shine, man that stuff is AMAZING!
@Sky, yes the 3 pak is the same as the brick, just costs more. You can buy a small hacksaw in the hardware aisle at Walmart, you'll be amazed how much money you save if you can buy the big grill brick and just slice off bits of it like a loaf of bread, when you need a fresh Slicker stone.
The Botfly is the Oklahoma state bird I think, and that's pretty much what I use the stones for. I wait until we've had a hard freeze, take my brick and where ever I see those tell tale gold spots that tell me there's bot eggs on the horse, I rub the stone over the spot and take the eggs off MUCH faster than with a bot knife.