Eclat pulse bmx cassette hub femalethe pulse cassette hub is groundbreaking to say the least a principal in bmx cassette hubs and a pioneer in universal hub design since conception the pawls have been improved and the driver function has been tweaked to perfection the pulse cassette hub features clats own patented switch drive system which enables the hub to run both rsd and lsd with the same driver and the same hub shell features material 6061 t6 alloy refined hub shell axle female 1