Nontessori, is a term coined by my husband for all things that are 'Not Montessori'. It's a bit of a joke in our house. ;)
When your school can't afford the full set of real Montessori bells, but you still think musical education and auditory development is important... you get these sets on sale from Lakeshore and make your own lessons.
The lessons could work with any bells. Use what you have access to. Nontessori ALL the way... when necessary ;)