2 Pairs GEMFAN Hurricane Durable 3-Blade SL5125 5.1Inch Propeller Compatible with T-Mount toothpick Hyperbola 2004 motor Precise details: Just like the Gemfan Hurricane 4023-3 props the new SL5125 features Gemfan's innovative hub design that's compatible with both conventional 5mm and T-mount 1.5mm style shaft motors.This prop is one of the Best and probably the ONLY (At the time of release) 5" Ultralite prop that's compatible with T-Mount shaft motors. Specifications: Diameter:5.1" Pitch:2.5" Blades:3 Material:Polycarbonate BladeDiameter:129.54 HubThickness:5.5mm ShaftHole:5mmand1.5mmT-mountwiththeoptionalincludedinsert Weight:2.8/3.0g(withadapter) Package Included: 2*SL5125-3 CW Propellers 2*SL5125-3 CCW Propellers Recommended use: (these are just soft recommendations): AUW well under 400g 15-31g motor of 18mm width or more 3S-4S battery/kv setup Will work for higher weight quads and have excellent response but will just feel a bit underpowered due to its lightweight, low drag, low load nature SOME FOOD FOR THOUGHT REGARDING QUAD SETUPS: We recommend a motor that´s at least 18mm wide. Smaller will work fine but you´re giving up control performance for the sake of lightness. Depends what you want however. Next, many may want to run an ultralight or micro on 6S but more amperage and less volts seems to be more beneficial for flight characteristics, flight time and overall ease of use. The only time we recommend moving up in voltage is when the load on the battery becomes so excessive that it cannot maintain its voltage well. A 5â€camera carrying quad or racing quad will have significantly higher loads on them than an ultralight. We don´t recommend less than 3S, but more than 4S on micros and ultralights is also just going to be adding complexity and increased component risk and cost with not any real world gains. Because of how ESC´s work, they also prefer normal amperage instead of more voltage and less amperage to the point that higher volts with smaller equivalent capacity will not only be more complicated to tune and operate smoothly, but it will actually be less flight time. Of course this is all a very general perspective and it entirely depends on what you´re doing. This passage is intended for someone that does not have ample experience with building tons of setups. If you have that experience, this is not for you because you already know what you´re going to do...this discussion is endless…