Yep that's exactly what they are!
And i used the tourmaline/power sand S because they compliment each other. The tourmaline helps energize the substrate for the bacteria, the power sand s comes with peat/lava rock and things to help buffer the water as well as Clear Super and Bacter 100. My objective there is having as much beneficial bacteria as possible in this tank for all the shrimp, and proper water conditions. So far so good. Plus I still have plenty of tourmaline left, and the power sand is relatively cheap.. Not to mention that I quickly found out I didn't buy enough aquasoil for this tank originally even if I didn't use it for shrimp breeding so I'd have to buy more anyways.