Custom railings for stairs made of several materials can be more comfortable than others. For example, if you put a wooden handrail on top of metal supports, it will be much more pleasant to hold on to them. The metal acts as the posts, and the wood as the handrails. It is good if these materials are also actively involved in the interior.
Another duet is glass and metal. Glass panels can be complemented by stainless steel handrails.