At Spinergy, we listen to the needs of our customers whether they be great or small. Some of our ZX-1 Power Add-On users have requested longer armrests for greater comfort and performance. For those users who have longer arms or prefer an armrest length of greater than 14 inches (35.5 cm.) on either or both sides, we offer a customized Armrest Extension option that adds another 4 inches (10 cm.) of length.