Material- Durable Heavy-gauge Steel-epic quality with strong structure and material, no rust & less noise Effective Time Saving - Make Seed Starting a Breeze: Using 4 Cell Soligt Seed Blocker make soil cube quickly and easily; strong working structure helps soil cubes better separated from soil blocker, soil blocking tool will not getting stuck; higher germination rate makes seed starting so much easier. No Transplant Shock - Healthier Seedling: Do not need to pull out the seedling from seed cell tray, it is easy to transplant seedling without injuring the root. No Pot Needed - Environmentally Friendly: Grow seeds on 2 inch soil blocks directly, reducing dependence on plastic pots or cell trays, less plastic waste; saving money and no more keep buying disposable seed container.