 "3 in 1 Stacking Grid Light Modifier System for CANON 580EX/ 580EX II Flash Speedlite, SG-C GRID"
"
The Light Modifier was designed to produce 3 different size of light spread (Small, Medium and Large) and when aligned and stacked two grids together, produce the smallest spots of light. Stack the small grid into the bezel to produce large size spots of light, for medium size spots of light just stack the larger size grid into the bezel." 
 "16GB CF CARD (400X)" (400X) | Tradineur.com"
"Tipología: Compact Flash analogico; Capacidad: 16 GB; Velocidad de escritura max: 30 MB/s; Velocidad de lectura max: 60 MB/s; Función protección datos: No" 