Instruct: Classify the given review as either positive or negative.
Query: People are dumb.

Rockwool, is the BEST for controlling the moisture and nutrient content of your medium. Period. It holds the most oxygen, is the most easily flushed, holds moisture for the most optimum amount of time, so on, and so forth.These 1.5's are great, they go directly into the 6-4 inch blocks.. And the wrapped cubes are great for clones because, once they are PROPERLY treated, they retain the perfect moisture/oxygen content. 100% successes rate, if you know what your doing. They make books..Product arrived smashed in a tiny box. Otherwise 5 star.