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Rockwool Build And Size: Each pack contains 4 pcs 28 holes rockwool grow cubes pieces made from rockwool the full sheet measures 168×295×40mm and each hole measures 40×40×40mm the pre-formed holes make planting quick and tidy Good Water And Air Balance: The 40×40×40mm stone rock wool planting cube holds moisture while still allowing oxygen to reach the roots this helps seeds and cuttings establish without becoming too wet Sterile Soilless Material: The seed plugs for hydroponic use are clean and free from soil which reduces the chance of disease and gives seedlings a stable start in early growth the material also keeps its shape after soaking Easy To Use: The hydroponic growing greenhouse blocks can be soaked in water and then planted with seeds or cuttings no cutting is needed and the sheets fit standard seed trays making setup simple for beginners Wide Use: Suitable for tomatoes soilless planting propagation cloning seeds and germination the blocks work for herbs vegetables and young plants in indoor or greenhouse setups and can be moved into larger systems as plants grow