The RocketStor 6361A allows you to quickly add any PCIe x4, x8 or x16 card to your Thunderbolt™ capable computing platform, such as media capture, Ethernet, Fibre Channel, or external Storage/RAID controller cards. The ultra slim, lightweight design is ideal for Mac Pro workstations and MacBook portables. The RocketStor 6361A may be the industry's most compact and lightweight PCIe expansion solution. The unit is only 2.3" wide, stands less than 7 inches tall, and weighs less than 4 lbs, yet is capable of supporting full-sized PCIe cards; an ideal solution for high-performance MacBook platforms.