[2x THICKER] than most seed trays, making them more cost effective and durable. Our seed trays don't easily warp when left in the sun.[WATERING SUGGESTIONS] If you use bottom watering tray (not included), occasionally water from the top to rid soil of excess salts.[CELL SIZE] 72 cell seedling trays are the most widely used and Best size for starting herbs, vegetables, and flowers.[CELL DESIGN] The hole at the base of each cell encourages aeration and deters root rot from excess watering, while ridges along cell walls facilitate root expansion.[BPA FREE] Food-grade plastic is safe for all edible plants, yet sturdy and thick enough that, when handled according to enclosed guidelines, will last for many growing seasons.size:53x27cmMaterial:plasticcolour:BlackPackage Contents:10 x Seed StarterOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.