Material: High quality PP plastic rooting ball, sturdy propagation shells are strong enough to be reused for years.Our package contains 3 variants (S, M, L) for growing different sizes of plant roots.The diameter of the root balls is: small 5 cm, medium 8 cm, large 12 cm.Safety Lock: The plant rooting ball has four caps and corner locks that fit together.This plant rooting box secures the branch to hold the propagator in place.However, you can use plastic ties to hold the shells securely.Easy to use: Where rooting is needed, peel off the bark to a width of about 2-2.5cm.Place damp moss or garden soil in the plant's root growth area.Wrap the plant's root growth area filled with damp moss or garden soil around the stripped bark.Normally, you can see propagation results within 6-8 weeks after installation.No Damage: Plant propagation air layer pods are harmless to the mother plant and will not cause any damage, because only a small branch on the mother plant is used for rooting, it grows together with the mother plant,therefore breaking after rooting will have no effect on the mother plant.Compared to other plant propagation techniques, the success rate is higher.Wide Applications: Plant root grow boxes use air layering method which is to grow roots directly on branches, reproduce a more mature plant faster than normal propagation methods.used for indoor and outdoor trees, such as roses, fruit trees and hard-to-root trees such as magnolias and camellias.