diff --git a/go.mod b/go.mod
index 44df2ed..aa2a4a2 100644
--- a/go.mod
+++ b/go.mod
@@ -16,6 +16,7 @@ require (
 	github.com/robfig/cron v0.0.0-20180505203441-b41be1df6967
 	github.com/stretchr/testify v1.2.2 // indirect
 	github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2 // indirect
+	golang.org/x/arch v0.0.0-20181203225421-5a4828bb7045 // indirect
 	golang.org/x/net v0.0.0-20181220203305-927f97764cc3 // indirect
 	golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 // indirect
 	golang.org/x/sys v0.0.0-20181221143128-b4a75ba826a6 // indirect
diff --git a/go.sum b/go.sum
index 0e1ac3c..1dcdf49 100644
--- a/go.sum
+++ b/go.sum
@@ -32,6 +32,8 @@ github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2 h1:EICbibRW4JNKMcY+LsWmuwob+CRS1BmdRdjphAm9mH4=
 github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2/go.mod h1:VFNgLljTbGfSG7qAOspJ7OScBnGdDN/yBr0sguwnwf0=
+golang.org/x/arch v0.0.0-20181203225421-5a4828bb7045 h1:Pn8fQdvx+z1avAi7fdM2kRYWQNxGlavNDSyzrQg2SsU=
+golang.org/x/arch v0.0.0-20181203225421-5a4828bb7045/go.mod h1:cYlCBUl1MsqxdiKgmc4uh7TxZfWSFLOGSRR090WDxt8=
 golang.org/x/net v0.0.0-20181220203305-927f97764cc3 h1:eH6Eip3UpmR+yM/qI9Ijluzb1bNv/cAU/n+6l8tRSis=
 golang.org/x/net v0.0.0-20181220203305-927f97764cc3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 h1:YUO/7uOKsKeq9UokNS62b8FYywz3ker1l1vDZRCRefw=
diff --git a/modules/apiact/line/component.go b/modules/apiact/line/component.go
index d5ad793..12a4c98 100644
--- a/modules/apiact/line/component.go
+++ b/modules/apiact/line/component.go
@@ -85,3 +85,22 @@ type TextComponent struct {
 	Color    NullString  `json:"color,omitempty"`
 	Action   interface{} `json:"action,omitempty"`
 }
+
+// NewBoxComponent -
+func NewBoxComponent(layout string) (box *BoxComponent) {
+	box = &BoxComponent{}
+	box.Type = "box"
+	box.SetLayout(layout)
+	return
+}
+
+// SetLayout -
+func (p *BoxComponent) SetLayout(layout string) {
+	switch layout {
+	case "horizontal":
+	case "vertical":
+		p.Layout = layout
+	default:
+		p.Layout = "horizontal"
+	}
+}
diff --git a/modules/apiact/line/container.go b/modules/apiact/line/container.go
index 5a2bcd7..6b724d7 100644
--- a/modules/apiact/line/container.go
+++ b/modules/apiact/line/container.go
@@ -44,9 +44,23 @@ func NewCarouselContainer() *CarouselContainer {
 }
 
 // AddContent -
-func (p *CarouselContainer) AddContent(obj ...*BubbleContainer) (err error) {
-	if len(obj) == 0 {
+func (p *CarouselContainer) AddContent(items ...*BubbleContainer) (err error) {
+	if len(items) == 0 {
 		return errors.New("no item")
 	}
+	if len(items) > 10 {
+		return errors.New("too many items")
+	}
+	if len(items)+len(p.Contents) > 10 {
+		return errors.New("too many items")
+	}
+
+	for _, v := range items {
+		if v == nil {
+			continue
+		}
+		p.Contents = append(p.Contents, v)
+	}
+
 	return
 }