High Quality: The garden clone collar is made of high-quality sponge, soft, breathable, reusable, and waterproof, ensuring the friendly growth of plants. For plants, it is very suitable for organic and hydroponic growers 30 Pack of Cloning Collars: These collars are perfect for net pots and hydroponic or aeroponic growing. 1.89 inch (Diameter) x 0.75 inch (Height) - 5cm x 1.9cm. Perfect for professional or DIY home cloning machines and kits Special Spoke Design: The and improved spoke design provides you with 8 and 1 hole to cushion tender cuttings. Improve planting efficiency, obtain and higher yields and healthier plants DIY Plants: Very suitable for hydroponic plant germination in DIY nursery boxes and cloning machines. Whether you are using a commercial cloning machine or a dedicated nursery box, this is the for plant germination Scope of Application: Whether you are using a commercial cloner or a DIY cloner, you can easily clone professionally. very suitable for DIY cloning machine Colour:black Material:sponge Package Contents: 30 Pack * Cloning Collars Inserts Premium Grade Foam Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.