As much as a onewheel is a necessity to life, flight fins are a necessity to a onewheel. Not that neither are a necessity, but both are game changers to my happiness. Very happy to purchase flight fins. Put them on the stock gt carbon fiber fender and it's solid, love the full flight system with minis I have on my xr although they fall off from overtightening, I think the minis still need work to perfection but I love how comfy they are. If you haven't bought a fender yet, get the full flight system, Ivewasted too much money on other fenders, theirs is by far solid and beautiful