OMS Grey/Black 45Lb-20Kg Aluminum SmartStream Twin Tank BC System with Performance Double Wing S11518129 SmartStream Harness System with Aluminium Backplate complete with Grey & Black Performance Double Wing providing 45Lb � 20 Kg Lift. The OMS Smartstream Harness System ensures adjustment is as easy as possible, Includes all Stainless Steel hardware, D-rings, Belt Slides and Buckle. One Size Fits All.