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Mother earth perlite is naturally occurring siliceous rock that when heated to 1600 Degree F expands to 20 times its original volume. This kilning process is very similar to popping popcorn & produces a growing media that is sterile & has a neutral pH of 7.0 the exceptional physical properties of this perlite make it tops in the perlite world for adding porosity to soil & soilless mixes. This perlite has numerous hydroponic applications as well. The #4 is the largest perlite on the market & averages a whopping size of around 1". the #3 measures around 1/2" & the coarse is about 1/8 to 1/4".