This offer from treesandplantsuk is for a box containing 75 x Plug Plant Seed Trays with 104 cells per unit. They are black and made from plastic and have dimensions as follows 380mm in length, 260mm in width, and 45mm in height. These black trays are suitable for both indoor and outdoor use a perfect choice  for starting your seedlings in a convenient and efficient manner. The trays have been designed with a unique strong profile for improved rigidity and a raised peripheral fence to assure watering is evenly administered.