UPuper Slab 98ct 20 sheet case98 cubes sheet Case of 20 slabs UPuper CP T36 rockwool plugs are designed for seedling and cutting propagation prior to "blocking on" into larger growing blocks. It gives the root system more space to grow and has good performance in terms of practicality and effect Rockwool cloning plugs are an easy and efficient way to clone plant cuttings. These plugs are made from mineral wool and provide a secure and supportive growing medium from which plants