Recommended for long-term crops such as tomatoes and cucumbers or plants which require a larger volume of media for growth. Special Features: • 1 ½” Rectangular cut-out for insertion of STG Grow Cubes. • Plastic sleeve which blocks algae, prevents heat build-up and reduces evaporation. • Plants can be started in STG Grow Cubes and transplanted to STG Grow Blocks or can be started directly in STG Grow Blocks. • Suitable for larger plants. • Compatible with STG Grow Slabs. • Compatible with STG Flood and Drain Mats.Hydroponic System Compatibility: Drip, Ebb & Flow, Float, NFT, Wick, Aeroponic