If you mean the shrouds, they are...
If you mean the shrouds, on my 1980 Hunter 30, the upper shroud is attached by long stainless steel straps which are bolted to the main bulkhead separating the cabin and the head. The two lower shrouds are each attached, also by straps and bolts to a substantial wooden support that is glasses to the hull, forms part of the internal cabinet structure and supports a portion of the deck.