My HCM beads are made of clay and Viper's beads are made of silica gel, not silicone.
I also have untreated grade one silica gel beads and I use them in special applications where they work better. The small size of the HCM beads kind of limits thier use in some situations.
The untreated silica gel beads work fabulously, and would be an excellent choice, but the HCM beads work far better. It just doesn't make sense to offer two things so I stopped offering the HCS beads. Don't know if I'll get more in the future or not.
The HCS beads like the HCM beads can be set at any RH%age and changed at any time. Makes them nice to use.
