Perfect Seed Trays - Size: 54 x 28mm and 50 cells per tray. 50 cells on surface can enough space to seeds of your favortie . The air hole on top can make that air flows soomthly and the drain hole at bottom can prevent from overwatering. Thickend Base Trays with NO DRAIN HOLES. Best solution for soil or hydroponic in greenhouse. 1.5mm thickness base tray, strong and durable, they can not be easily broken even if filled with water or soil. Seedling tray and base tray are perfect matched, base tray can hold the excess water from seedling tray. Optimal Solution for Greenhouse & - With kit, you can easily seedlings in your garden or greenhouse as a foundation for your dream of a beautiful garden filled with all kinds of flowers and green plants. At the same time you can reuse these trays, they are made of durable and environmentally friendly plastic material. color:Black Material:plastic size: Single hole 54 x 28mm Package Contents: 5 x 50-hole seedling tray Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real . The measurement allowed error is +/- 1-3cm.