Fangrui Product Details 1. These 50 Rockwool Starter Plugs Are Made Of Molten Rock Spun Into Fibers & Compressed Into Cubes. For Hydroponics, Seed Starting, Plant Propagation & Rooting Cuttings. Pre-drilled Planting Holes Make Seeding And Propagation Easy. High Water Absorption & Oxygen Retention Encourages Faster Rooting. Easy Transplant To Net Pots, Soil, Or Planting Machine After Rooting. Great For Hobby And Commercial Growers Alike. 2. Features 3. Made From Molten Rock Spun Into Cotton Candy-like Fibers And Then Compressed Into Cubes, Blocks, Or Slabs. 4. Great For Rooting Cuttings Clone Plants, Germination Start Seeds And More. Encourages Faster Initial Rooting & Its Firmness Is . 5. Much Easier Than Starting In Soil! Predrilled Planting Holes Make Seeding And Plant Propagation A Breeze. Great For Hobby And Commecial Growers. 6. These Rockwool Starter Plugs Are Widely Used In Hydroponic, Seed Starting, Cuttings, Plant Propagation And So On. 7. Rockwool Grow Cubes Keep The Seeds Long Enough To Establish A Root System Because Of They Have High Water Absorption While Retain A Lot Of Oxygen, Cubes Will Not Sepreate After Immersion, Easily Transplant To Net Pots, Soil, Planting Machine After Rootted. 8. Specification 9. Material: Rock Wool 10. Color: Green 11. Size: 444cm / 1.61.61.6in 12. Weight: 240g 13. Package Include: 14. 50 Rock Wool Blocks