diff --git a/paradocx/headerfooter.py b/paradocx/headerfooter.py
index 260aa98..d6c262d 100644
--- a/paradocx/headerfooter.py
+++ b/paradocx/headerfooter.py
@@ -3,7 +3,7 @@
 
 class HeaderPart(DefaultNamed, Part):
     content_type = (
-        "application/" "vnd.openxmlformats-officedocument.wordprocessingml.header+xml"
+        "application/vnd.openxmlformats-officedocument.wordprocessingml.header+xml"
     )
     rel_type = (
         "http://schemas.openxmlformats.org/officeDocument/2006/relationships/header"
@@ -13,7 +13,7 @@ class HeaderPart(DefaultNamed, Part):
 
 class FooterPart(DefaultNamed, Part):
     content_type = (
-        "application/" "vnd.openxmlformats-officedocument.wordprocessingml.footer+xml"
+        "application/vnd.openxmlformats-officedocument.wordprocessingml.footer+xml"
     )
     rel_type = (
         "http://schemas.openxmlformats.org/officeDocument/2006/relationships/footer"
diff --git a/paradocx/numbering.py b/paradocx/numbering.py
index f1484cc..5c237a5 100644
--- a/paradocx/numbering.py
+++ b/paradocx/numbering.py
@@ -3,12 +3,10 @@
 
 class NumberingPart(DefaultNamed, Part):
     content_type = (
-        'application/'
-        'vnd.openxmlformats-officedocument.wordprocessingml.numbering+xml'
+        'application/vnd.openxmlformats-officedocument.wordprocessingml.numbering+xml'
     )
     rel_type = (
-        'http://schemas.openxmlformats.org'
-        '/officeDocument/2006/relationships/numbering'
+        'http://schemas.openxmlformats.org/officeDocument/2006/relationships/numbering'
     )
     default_name = '/word/numbering.xml'
 
diff --git a/paradocx/settings.py b/paradocx/settings.py
index e8ca0ab..1934406 100644
--- a/paradocx/settings.py
+++ b/paradocx/settings.py
@@ -3,10 +3,9 @@
 
 class SettingsPart(DefaultNamed, Part):
     content_type = (
-        'application/' 'vnd.openxmlformats-officedocument.wordprocessingml.settings+xml'
+        'application/vnd.openxmlformats-officedocument.wordprocessingml.settings+xml'
     )
     rel_type = (
-        'http://schemas.openxmlformats.org'
-        '/officeDocument/2006/relationships/settings'
+        'http://schemas.openxmlformats.org/officeDocument/2006/relationships/settings'
     )
     default_name = '/word/settings.xml'
diff --git a/paradocx/styles.py b/paradocx/styles.py
index 68f549f..5ce2296 100644
--- a/paradocx/styles.py
+++ b/paradocx/styles.py
@@ -9,7 +9,7 @@
 
 class StylesPart(DefaultNamed, Part):
     content_type = (
-        "application/" "vnd.openxmlformats-officedocument.wordprocessingml.styles+xml"
+        "application/vnd.openxmlformats-officedocument.wordprocessingml.styles+xml"
     )
     rel_type = (
         "http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles"