I acquired my NAT from Xuefei Liu in 2013.
The NAT is a notched belay tube. It is forged from aluminum alloy and soft anodized. Mine is 45 mm. long, 55 mm. wide, 86 mm. high, and weighs 63 g. It has two slots with ribbed v-grooves and a plastic-covered cable keeper. The slots are 35 mm. long and 15 mm. wide. The top of the Omega oval carabiner that I use for comparing belay tubes sits 15 mm. below the ends of the slots.
One side is printed with a climber icon, a forearm & hand holding a rope icon, and "NAT."
The following belay tubes are essentially identical:
|Brasovia Notched||Epic Peak||NTR|
|Climb Tech||Fusion Neo-Sat||Stubai BC PRO|
|Cypher||Good Makings Notched||Yoke|
The shallow V-notches used in this design do not seem to be very effective at increasing the braking force. The notches do not have the narrow angle found on the Trango Jaws and its equivalents, so they do not create the same wedging action.