This product is ideal for seedling growing and for transplanting. Its made out of fine grade treated coco peat with a E.C content of below 0.4 mS/cm and pH levels are between 5.5-6.7. You can plant any kind of seed in these coco peat plugs/pellets. The outer tissue paper is biodegradable. You have 32 mm diameter x 12 plugs in one tray.