Home / Forums / Buying a melodica / Differences in key size (width and length) between melodica brands, models? / Reply To: Differences in key size (width and length) between melodica brands, models? Reply To: Differences in key size (width and length) between melodica brands, models? September 8, 2022 at 6:58 am #14401 James BeattieParticipant Thanks Lamar. I’ll see if anyone else replies with more details, and will also try and contact a couple of the manufacturers although I won’t be holding my breath for them to reply!