Here at SipDark we get a lot of questions comparing our Soapstone product versus our Stainless steel. One of our goals is to manage the proper expectations for our customers and to educate them so we can help get them into the right product.
Soapstone is a non-pours material, meaning it will not absorb any tastes or smells. On average, one Soapstone will chill your 3oz beverage 5 degrees and adds a slight chill to take the edge off of room temperature. Three of these stones will equal about one ice cube. This is your more traditional way of chilling your favorite whiskey.
Stainless Steel stones are a newer design that's made of the same stainless steel found in your typical restaurant, and is filled with a non-freezing alcohol (safe if consumed). The point of using the alcohol is because it has a lower freezing point than ice. Typically one of these stones will drop the temperature of your 3oz drink 12 degrees, similar to adding 1 ice cube.
To sum it up: If you're looking to take a slight edge off of your room temperature whiskey, we would suggest using soapstone. If you're looking for more of a chilled beverage, go with the stainless steel. Both are a great accessory to add to chill your beverage without diluting it!
We have a great video demonstrating the differences in temperatures between our products!