The material is ceramic-coated polyurethane.
The pump is connected to the module by means of an additionally flow straightener. The flow straightener must be glued to the module after the pump has been correctly aligned. (Silicone, superglue, etc.) As with a bayonet, you can remove the pump at any time for maintenance.
The module is lightweight and usually does not affect the holding power of the magnet.
The deco rock looks the same as on the Shopfoto. Where you use the module is up to you, the flow requirements and your imagination.