diff --git a/MVMCoreUI/Atoms/Views/Arrow.swift b/MVMCoreUI/Atoms/Views/Arrow.swift
index 7ae112cc..e932dd60 100644
--- a/MVMCoreUI/Atoms/Views/Arrow.swift
+++ b/MVMCoreUI/Atoms/Views/Arrow.swift
@@ -19,6 +19,21 @@ open class Arrow: View {
         return model as? ArrowModel
     }
     
+    //--------------------------------------------------
+    // MARK: - Constraints
+    //--------------------------------------------------
+    
+    public var heightConstraint: NSLayoutConstraint?
+    public var widthConstraint: NSLayoutConstraint?
+    
+    public func pinHeightAndWidth(constant: CGFloat = 12) {
+        
+        heightConstraint = heightAnchor.constraint(equalToConstant: constant)
+        widthConstraint = widthAnchor.constraint(equalToConstant: constant)
+        heightConstraint?.isActive = true
+        widthConstraint?.isActive = true
+    }
+    
     //--------------------------------------------------
     // MARK: - Lifecycle
     //--------------------------------------------------
diff --git a/MVMCoreUI/Atoms/Views/ArrowModel.swift b/MVMCoreUI/Atoms/Views/ArrowModel.swift
index 926a9ea7..2547f8d1 100644
--- a/MVMCoreUI/Atoms/Views/ArrowModel.swift
+++ b/MVMCoreUI/Atoms/Views/ArrowModel.swift
@@ -20,6 +20,9 @@ open class ArrowModel: MoleculeModelProtocol {
     public var degrees: Float = 0
     public var lineWidth: CGFloat = 1
     
+    public var height: CGFloat = 12
+    public var width: CGFloat = 12
+    
     //--------------------------------------------------
     // MARK: - Keys
     //--------------------------------------------------
@@ -31,6 +34,8 @@ open class ArrowModel: MoleculeModelProtocol {
         case degrees
         case size
         case lineWidth
+        case height
+        case width
     }
     
     //--------------------------------------------------
@@ -52,6 +57,14 @@ open class ArrowModel: MoleculeModelProtocol {
         if let lineWidth = try typeContainer.decodeIfPresent(CGFloat.self, forKey: .lineWidth) {
             self.lineWidth = lineWidth
         }
+        
+        if let height = try typeContainer.decodeIfPresent(CGFloat.self, forKey: .height) {
+            self.lineWidth = height
+        }
+        
+        if let width = try typeContainer.decodeIfPresent(CGFloat.self, forKey: .width) {
+            self.width = width
+        }
     }
     
     public func encode(to encoder: Encoder) throws {
@@ -61,5 +74,7 @@ open class ArrowModel: MoleculeModelProtocol {
         try container.encode(color, forKey: .color)
         try container.encode(degrees, forKey: .degrees)
         try container.encodeIfPresent(backgroundColor, forKey: .lineWidth)
+        try container.encode(width, forKey: .width)
+        try container.encode(height, forKey: .height)
     }
 }