CARBON EXPRESS MAXIMA PHOTON SD ARROWS 400 6 PK. The Maxima Photon SD has a .203” inside diameter, 18 grain aluminum half-out insert, & light weight carbon design for speed, less drop, more penetration, & less wind drift for hunters, field, and 3D shooters. It combines stiffer ends with a softer spine center plus 30-ton carbon construction for faster recovery and down range accuracy.