Ancient Air-Layering Propagation - This garden tool uses the ancient method of air stratification, that is, the roots are directly grown on the branches to replicate existing plants and produce new plants. Safe to Parent Plant - The plant propagation air layer pods are safe for the mother plant and will not cause any damage to spread at any time! Safety locks ? designed with plugs and corner locks that interlock with each other and are fixed to the branches to secure the spreader in place, even if there are no rods underneath. Reusable ? The breeding shell is durable and can be used repeatedly, so you can clone more plants according to your preferences. Specifications: Material: PP plastic Sizes: S-5 cm M-8 cm L-12 cm Package Included:3 plant rooting box