This is the replacement 12 blade impeller for the 90mm DPS series Electric Ducted Fan units.
These impellers feature dynamic balancing, efficient CAD design and are made of glass reinforced plastic material for strength.
Blade count: 12
Hub diameter: 8mm
Thickness @ hub: 25mm
Performs well on static testing. Needed some balancing weight (quality 4). Be careful, the picture above shows the front side of the fan. The blades slope towards the back. Much better thrust when mounted the right way around:)