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Sent the wrong props. They are useless to me. Not worth trying to deal with customer service but HK come on. This is going on for a while and you don't correct it?I bought this product for the Quanum Nova, but did not match the hub. smaller centers from the original slot. The props I received were not Turnigy props but GEMFAN. They have 5mm shaft diameter, but need 8 mm for Nova!Be aware of this is NOT compatibly with Quanum nova, so if you want to buy some spare props for that, look elsewhere...Propellers that I received are not Turnigy but Gemfan . It is not compatible with the Quanum nova , the hole is different .The props I received were not Turnigy props but GEMFAN. They have 5mm less body clearance than the NOVA props which curve up to the tips giving better body clearance. I think my NOVA is less stable with these props possibly because of the marginal body clearance so will be looking for another supply of Nova props.Can never have enough props. These were pretty balanced dont known of I was lucky or the norm but made me happy.Great value for money work great didn't have to balance spot onPretty much the same as the Quanum Nova ones and good replacements. Shipping wasn't back.Product with original quality, providing more security to make landings.