Amount : 20 pieces Color: Black Product size: 8cm in diameter Premium Material: Made of high quality PP plastic, strong and durable, can be used many times for a long time. Safe and non-toxic, it will not affect plant growth. Plant Propagators: Using the age-old method of air stratification, roots directly onto branches, propagating existing plants and producing new ones . It is suitable for indoor and outdoor plants. Fast rooting: This is specially created with a cutting ball design to help your cuttings gain stronger roots for more mature plants faster than normal propagation methods. SAFETY LOCK: Designed with a locking button and 4 corner locks, the plant growth ball can be firmly fixed in place and wont fall off even if there is no support underneath. Easy to use: choose healthy plant branches and cut a ring of bark. Fill the plant rooting unit with moist soil, then attach the rooting box to where the bark will be removed.