The Xundah YD-H75 is a massively constructed, largely plastic derailleur - but it looks like it means business in a Shimano Tourney Megarange kind of way. I have no evidence for or against its performance or longevity.

(I also wrote exactly this for the Saiguan HG-54).

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• Derailleur brands: Xundah
• Country: China
• Date of introduction: 2007?
• Date of this example: unknown
• Model no.: YD-H75
• Weight: 341g including hanger plate
• Maximum cog: 34 teeth
• Total capacity: 38 teeth
• Pulley centre to centre: 96mm
• Index compatibility: 7 speed
• Chain width: 3/32”
• Logic: top normal
• B pivot: sprung
• P pivot: sprung
• Materials: plastic knuckles and outer parallelogram plate, steel inner parallelogram plate and pulley cage plates