diff --git a/src/escpos/printer/cups.py b/src/escpos/printer/cups.py
index a7ee2c8..e2eea8d 100644
--- a/src/escpos/printer/cups.py
+++ b/src/escpos/printer/cups.py
@@ -167,7 +167,6 @@ class CupsPrinter(Escpos):
         """Append any command sent in raw format to temporary file.
 
         :param msg: arbitrary code to be printed
-        :type msg: bytes
         """
         self.pending_job = True
         try:
diff --git a/src/escpos/printer/lp.py b/src/escpos/printer/lp.py
index e8b7bcf..ff22e05 100644
--- a/src/escpos/printer/lp.py
+++ b/src/escpos/printer/lp.py
@@ -186,7 +186,6 @@ class LP(Escpos):
         """Write raw command(s) to the printer.
 
         :param msg: arbitrary code to be printed
-        :type msg: bytes
         """
         assert self.device is not None
         assert self.device.stdin is not None
diff --git a/src/escpos/printer/network.py b/src/escpos/printer/network.py
index 7a2d5c1..d033856 100644
--- a/src/escpos/printer/network.py
+++ b/src/escpos/printer/network.py
@@ -114,7 +114,6 @@ class Network(Escpos):
         """Print any command sent in raw format.
 
         :param msg: arbitrary code to be printed
-        :type msg: bytes
         """
         assert self.device
         self.device.sendall(msg)
diff --git a/src/escpos/printer/serial.py b/src/escpos/printer/serial.py
index 66592af..28ada62 100644
--- a/src/escpos/printer/serial.py
+++ b/src/escpos/printer/serial.py
@@ -155,11 +155,10 @@ class Serial(Escpos):
                 return
         logging.info("Serial printer enabled")
 
-    def _raw(self, msg) -> None:
+    def _raw(self, msg: bytes) -> None:
         """Print any command sent in raw format.
 
         :param msg: arbitrary code to be printed
-        :type msg: bytes
         """
         assert self.device
         self.device.write(msg)
diff --git a/src/escpos/printer/usb.py b/src/escpos/printer/usb.py
index 20743ad..e5d2dbe 100644
--- a/src/escpos/printer/usb.py
+++ b/src/escpos/printer/usb.py
@@ -185,7 +185,6 @@ class Usb(Escpos):
         """Print any command sent in raw format.
 
         :param msg: arbitrary code to be printed
-        :type msg: bytes
         """
         assert self.device
         self.device.write(self.out_ep, msg, self.timeout)
diff --git a/src/escpos/printer/win32raw.py b/src/escpos/printer/win32raw.py
index 8de56eb..d084436 100644
--- a/src/escpos/printer/win32raw.py
+++ b/src/escpos/printer/win32raw.py
@@ -152,7 +152,6 @@ class Win32Raw(Escpos):
         """Print any command sent in raw format.
 
         :param msg: arbitrary code to be printed
-        :type msg: bytes
         """
         if self.printer_name is None:
             raise DeviceNotFoundError("Printer not found")