Features:_x000D_ _x000D_ 99.99% brand and high quality, reliable and safe. _x000D_ The shape is mostly round and oval, suitable for hydroponic plant and soilless culture. _x000D_ It can replace horticultural soil to filter water quality and maintain water and nutrients. _x000D_ It produces negative ions and promotes plant growth, safe for your plants. _x000D_ Easy to use and can be reused after cleaning, much more convenient. _x000D_ _x000D_ Specification:_x000D_ Condition: 99.99% Brand _x000D_ Material: clay carbon_x000D_ Diameter: Approx. 1.5cm / 0.6in (irregular)_x000D_ Weight: Approx. 100g / 3.5 oz_x000D_ _x000D_ Package list:_x000D_ 1 Pack * Water Planting Tool 199.99% brand and high quality, reliable and safe 2The shape is mostly round and oval, suitable for hydroponic plant and soilless culture 3It can replace horticultural soil to filter water quality and maintain water and nutrients 4It produces negative ions and promotes plant growth, safe for your plants 5Easy to use and can be reused after cleaning, much more convenient