They are made of long durable material suitable for food and thus, seeds from coconut-growing tablets to young plants can all easily be planted and are connected via bayonet fittings to the growth core (substrate bag).
The i3-Dock is permanently reusable, easy to clean, consists of 3 parts and can be easily assembled without tools. Young plants are simply pressed from above with the root balls, with larger plants the i3-Dock is put together around the large root ball.
The set consists of: 6x i3-Docks1, 6x i3-Covers in a reusable poly bag
Tutorial on the assembling of i3-Docks (plant-holder) without tools