What paper types are supported by the HP LaserJet Pro MFP M28-M31?
The printer supports plain paper (75–89 g), light paper (65–74 g), heavy paper (90–120 g), labels, envelopes, and bond paper. All of these paper types are compatible with the input tray. (Page 8)
From the official HP Laserjet Pro Mfp M28 M31 Printer manual, page 8
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