diff --git a/lib/src/mask_parser_iterator.dart b/lib/src/mask_parser_iterator.dart
index 368d51b..bde998c 100644
--- a/lib/src/mask_parser_iterator.dart
+++ b/lib/src/mask_parser_iterator.dart
@@ -66,7 +66,7 @@ extension NumberFormatPartExt on String {
                 result.add(StaticPart(content));
                 content = '';
               }
-              result.add(CurrencySignPart(currencySign));
+              result.add(StaticPart(currencySign));
             } else {
               content += char;
             }
diff --git a/lib/src/part_length.dart b/lib/src/part_length.dart
deleted file mode 100644
index 93de55e..0000000
--- a/lib/src/part_length.dart
+++ /dev/null
@@ -1,32 +0,0 @@
-/// Describes the length constraints of a number format part.
-abstract class PartLength {}
-
-/// A fixed-length part.
-class DeterminedPartLength extends PartLength {
-  /// The exact length of this part.
-  final int length;
-
-  /// Creates a fixed-length constraint of [length].
-  DeterminedPartLength(this.length);
-}
-
-/// A variable-length part with minimum and maximum bounds.
-class VariablePartLength extends PartLength {
-  /// The minimum length of this part.
-  final int min;
-
-  /// The maximum length of this part.
-  final int max;
-
-  /// Creates a variable-length constraint between [min] and [max].
-  VariablePartLength(this.min, this.max);
-}
-
-/// A part with a minimum length and no upper bound.
-class AtLeastPartLength extends PartLength {
-  /// The minimum length of this part.
-  final int min;
-
-  /// Creates a minimum-length constraint of [min].
-  AtLeastPartLength(this.min);
-}
diff --git a/lib/src/parts.dart b/lib/src/parts.dart
index bf83f5a..0f29ade 100644
--- a/lib/src/parts.dart
+++ b/lib/src/parts.dart
@@ -1,6 +1,5 @@
 import 'package:flutter/material.dart';
 import 'package:number_editing_controller/src/grouping.dart';
-import 'package:number_editing_controller/src/part_length.dart';
 
 /// The result of formatting a single [NumberFormatPart].
 class PartFormatResult {
@@ -36,9 +35,6 @@ class PartFormatResult {
 
 /// A segment of a number format pattern that knows how to format its portion of input.
 abstract class NumberFormatPart {
-  /// The length constraints of this part.
-  PartLength get length;
-
   /// Formats the input [value] starting at [position] and returns the result.
   PartFormatResult format(TextEditingValue value, int position);
 }
@@ -48,9 +44,6 @@ class StaticPart extends NumberFormatPart {
   /// The static text content.
   final String content;
 
-  @override
-  PartLength get length => DeterminedPartLength(content.length);
-
   StaticPart(this.content);
 
   @override
@@ -84,12 +77,6 @@ class StaticPart extends NumberFormatPart {
   }
 }
 
-/// A [StaticPart] that represents a currency symbol.
-class CurrencySignPart extends StaticPart {
-  /// Creates a currency sign part with the given symbol [content].
-  CurrencySignPart(super.content);
-}
-
 /// A part that represents the integer portion of a number.
 class RealPart extends NumberFormatPart {
   /// The digit grouping configuration.
@@ -101,9 +88,6 @@ class RealPart extends NumberFormatPart {
   /// Creates a [RealPart] with the given [grouping] and [allowNegative] flag.
   RealPart(this.grouping, this.allowNegative);
 
-  @override
-  PartLength get length => AtLeastPartLength(1);
-
   @override
   PartFormatResult format(TextEditingValue value, int position) {
     var i = 0;
@@ -204,24 +188,6 @@ class DecimalPart extends NumberFormatPart {
   /// Creates a [DecimalPart] with the given length bounds and [decimalSeparator].
   DecimalPart(this.minLength, this.maxLength, this.decimalSeparator);
 
-  @override
-  PartLength get length {
-    if (minLength == 0 && maxLength == 0) {
-      return DeterminedPartLength(0);
-    }
-    if (minLength == 0 && maxLength != 0) {
-      return VariablePartLength(
-        0,
-        maxLength + decimalSeparator.length,
-      );
-    }
-
-    return VariablePartLength(
-      minLength + decimalSeparator.length,
-      maxLength + decimalSeparator.length,
-    );
-  }
-
   @override
   PartFormatResult format(TextEditingValue value, int position) {
     var i = 0;