# Is there a way to set kerning value for all masters at once via GUI?

**URL:** <https://forum.glyphsapp.com/t/is-there-a-way-to-set-kerning-value-for-all-masters-at-once-via-gui/24681>\
**Category:** Glyphs\
**Tags:** kerning\
**Created:** [January 4, 2023, 8:12pm UTC](https://forum.glyphsapp.com/t/is-there-a-way-to-set-kerning-value-for-all-masters-at-once-via-gui/24681 "2023-01-04T20:12:26Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![alexs](https://forum.glyphsapp.com/letter_avatar_proxy/v4/letter/a/2acd7d/32.png) [@alexs](https://forum.glyphsapp.com/u/alexs)\
**Post date:** [January 6, 2023, 10:55pm UTC](https://forum.glyphsapp.com/t/is-there-a-way-to-set-kerning-value-for-all-masters-at-once-via-gui/24681/21 "2023-01-06T22:55:48Z")

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Oh nice! Is there any logic or a way to know what is deep-copyable and what is not? Sometimes I stay away from those methods even if dir shows them because not sure how reliable it is, how deep it goes and so on.

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**Author:** ![GeorgSeifert](https://forum.glyphsapp.com/user_avatar/forum.glyphsapp.com/georgseifert/32/259_2.png) [@GeorgSeifert](https://forum.glyphsapp.com/u/GeorgSeifert)\
**Post date:** [January 7, 2023, 12:20am UTC](https://forum.glyphsapp.com/t/is-there-a-way-to-set-kerning-value-for-all-masters-at-once-via-gui/24681/22 "2023-01-07T00:20:10Z")

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All the `GS` objects are deep copied even when you just copy them.

Other than that you need to try. You can try to print the `repr()` of the original and the copy to see if all elements are different.

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