Cassettes/Freewheels without RATCHET?

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Hi there people,

I really want to know, are there any 7 speed cassettes without boring RATCHET? If, yes please suggest one.

I have a "screw on" cassette now.

Please advice!

The only one I can recall is Shimano's Silent Clutch design, but it's for a freehub and not a screw-on type freewheel.