diff --git a/structsect.go b/structsect.go
index fda9d32..3fac075 100644
--- a/structsect.go
+++ b/structsect.go
@@ -20,6 +20,7 @@ package docx
 import (
 	"encoding/xml"
 	"io"
+	"strconv"
 	"strings"
 )
 
@@ -31,8 +32,8 @@ type SectPr struct {
 
 // PgSz show the paper size
 type PgSz struct {
-	W xml.Attr `xml:"w:w,attr"` // width of paper
-	H xml.Attr `xml:"w:h,attr"` // high of paper
+	W int `xml:"w:w,attr"` // width of paper
+	H int `xml:"w:h,attr"` // high of paper
 }
 
 // UnmarshalXML ...
@@ -72,9 +73,15 @@ func (pgsz *PgSz) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
 	for _, attr := range start.Attr {
 		switch attr.Name.Local {
 		case "w":
-			pgsz.W = xml.Attr{Name: xml.Name{Local: "w:w"}, Value: attr.Value}
+			pgsz.W, err = strconv.Atoi(attr.Value)
+			if err != nil {
+				return err
+			}
 		case "h":
-			pgsz.H = xml.Attr{Name: xml.Name{Local: "w:h"}, Value: attr.Value}
+			pgsz.H, err = strconv.Atoi(attr.Value)
+			if err != nil {
+				return err
+			}
 		default:
 			// ignore other attributes now
 		}
diff --git a/theme.go b/theme.go
index 000c0a9..c3f1bb0 100644
--- a/theme.go
+++ b/theme.go
@@ -21,7 +21,6 @@
 package docx
 
 import (
-	"encoding/xml"
 	"io/fs"
 )
 
@@ -42,8 +41,8 @@ func (f *Docx) WithDefaultTheme() *Docx {
 func (f *Docx) WithA3Page() *Docx {
 	sectpr := &SectPr{
 		PgSz: &PgSz{
-			W: xml.Attr{Name: xml.Name{Local: "w:w"}, Value: "16838"},
-			H: xml.Attr{Name: xml.Name{Local: "w:h"}, Value: "23811"},
+			W: 16838,
+			H: 23811,
 		},
 	}
 	f.Document.Body.Items = append(f.Document.Body.Items, sectpr)
@@ -54,8 +53,8 @@ func (f *Docx) WithA3Page() *Docx {
 func (f *Docx) WithA4Page() *Docx {
 	sectpr := &SectPr{
 		PgSz: &PgSz{
-			W: xml.Attr{Name: xml.Name{Local: "w:w"}, Value: "11906"},
-			H: xml.Attr{Name: xml.Name{Local: "w:h"}, Value: "16838"},
+			W: 11906,
+			H: 16838,
 		},
 	}
 	f.Document.Body.Items = append(f.Document.Body.Items, sectpr)