The Sierra pen is the bigger brother of our Bella Pens. This is a good pen for an everyday carry suitable for him or her. The pen has a single barrel operating with a twist action by holding the bottom of the pen and barrel. All of our Sierra range of pens use a Parker G2 style ballpoint refill available from my pen spares & refills or any good high street pen shop. All of our Sierra pens come gift boxed with the option of gift wrapping available.