Difficult to obtain Popular JONGKIND hydro balls small-sized product Waterproof, excellent in ventilation, safe, sterile and clean Grain diameter is about 3-8mm, the size, shape, and color of the grain can be differentiated. there are actually used photos, so try to imagine small grains to medium grains, so the plants can be planted in the bowl, without scratches, and firmly clean the hydro balls after washing the water.
