JEGS Module Holder stores/protects 54 modules (45 RPM and 9 Retard) for use in MSD Ignition Boxes. Molded from solid yet pliable urethane to isolate each module and absorb vibration on the road or in the pits. Compact 6" x 1-3/4" x 4-1/2" case fits in glove or tool box. .