80 grams in 100% biodegradable bag
Particle size is about 1/8 to 1/4 inch

Looks cute as a top dressing or in your air plant display. 80 grams is enough to top dress a 4" pot.

Lava rock is an excellent soil amendment. Good water retention with excellent aeration. Volcanic lava rock does not break down, as it is inorganic.