include::partial$ft-obj-inherit-prop.adoc[]
|

|[[size-prop]]`size`
|Positive integer
|Size of this field type's instances (bits).

This property's value must be in the [1,{nbsp}64] range.
|Yes
|

|[[align-prop]]`alignment`
|Power-of-two integer
|Alignment of the first bit of this field type's instances within a
xref:how-barectf-works:ctf-primer.adoc#pkt[CTF{nbsp}packet] (bits).
|No
|8 if the <<size-prop,`size` property>> is a multiple of{nbsp}8,
or{nbsp}1 otherwise.

|[[pref-disp-base-prop]]`preferred-display-base`
|String
|
The preferred base (radix) to use when displaying this field type's
instances.

The value of this property is only a _hint_ to CTF consumers; they don't
have to consider it.

This property's value must be one of:

`bin`::
`binary`::
    Binary.

`oct`::
`octal`::
    Octal.
`dec`::
`decimal`::
    Decimal.

`hex`::
`hexadecimal`::
    Hexadecimal.

|No
|Decimal preferred display base
