ALPHA® tensoRED® Master Tensioning Frame is the latest development in Alpha’s stencil range of state-of-the-art printing stencils. ALPHA® tensoRED® has been designed to reduce the total cost of ownership of stencils compared to other systems by creating tension without the need of air pressure being applied to the frame.
Source: https://alphaassembly.com/Products/Stencils/tensoRED