DNP makes a range of multispeed freewheels to suit bikes from 7 speeds to 10 speeds. They use a 'screw on' freewheel system and are unique in that they offer small cogs starting at 11 teeth, where most brands (shimano etc) only offer teeth this small on the 'cassette' style rear gear systems, not the 'screw-on freewheel' style. DNP also makes a freewheel tool that is longer and has a larger hole bored in the tool, to fit over e-bike axles. It is compatible with Shimano freewheels.