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---
title: Master
---
A font master.
## Master.name
* Python type: `I18NDictionary`
* **Required field**
*Localizable.*
## Master.id
* Python type: `str`
* **Required field**
An ID used to refer to this master in the
`Layer._master` field. (This is allows the user to change the master name
without the layers becoming lost.)
## Master.location
* Python type: `dict`
A dictionary mapping axis tags to coordinates
in order to locate this instance in the design space.
*If not provided, defaults to* `None`.
## Master.guides
* Python type: [[`Guide`](Guide.html)]
* When writing to Babelfont-JSON, each item in the list must be placed on a separate line.
A list of guides.
## Master.metrics
* Python type: `dict`
A dictionary mapping metric names (string) to metric value (integer). The following
metric names are reserved: `xHeight,capHeight,ascender,descender`. Other metrics may be added to this dictionary
as needed by font clients, but their interpretation is not guaranteed to be
compatible between clients.
## Master.kerning
* Python type: `dict`
* When writing to Babelfont-JSON, each item in the list must be placed on a separate line.
I'll be honest, I haven't worked out how this is meant to work.
## Master.font
* Python type: `object`
* This field only exists as an attribute of the the Python object and should not be written to Babelfont-JSON.
Within the Python object, provides a reference to the font object containing this master.
*If not provided, defaults to* `None`.
## Master.customOpenTypeValues
* Python type: [[`OTValue`](OTValue.html)]
Any values to be placed in OpenType tables on export to override defaults
## Master._formatspecific
* Python type: `dict`
Each object in Babelfont has an optional attached dictionary to allow the storage
of format-specific information. Font creation software may store any additional
information that they wish to have preserved on import and export under a
namespaced (reverse-domain) key in this dictionary. For example, information
specific to the Glyphs software should be stored under the key `com.glyphsapp`.
The value stored under this key may be any data serializable in JSON; typically
it will be a `dict`.
Note that there is an important distinction between the Python object format
of this field and the Babelfont-JSON representation. When stored to JSON, this key
is exported not as `_formatspecific` but as a simple underscore (`_`).
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