Product pictures
Accessories
The tree grate is made of solid cast-iron. The tree grate has a square shape and the inner size is round. The tree grate consists out of 4 segments. The grate is standard black waxed. This layer is going to oxidate within some months, therefore the colour is getting darker. 
Material
cast iron (black waxed)

Documentation
Assembly Manual model Hunte
Productinformation Hunte