Can I change just the newel cap?

Yes, that is the quickest and cheapest way to refresh a staircase. The flat cap fits onto a standard newel post without replacing the post itself.

What is the difference between a flat and pyramid cap?

A flat cap gives a low, contemporary finish, while a pyramid cap is a more traditional pointed design. Both fit standard newel posts.

Will it match the rest of my black staircase?

Yes, it matches our black oak newel posts, handrails and spindles for a co ordinated modern balustrade.