diff --git a/src/main/java/land/oras/utils/Const.java b/src/main/java/land/oras/utils/Const.java
index b3dd8843..e7bb690f 100644
--- a/src/main/java/land/oras/utils/Const.java
+++ b/src/main/java/land/oras/utils/Const.java
@@ -460,4 +460,24 @@ public static String currentTimestamp() {
      * Metric name for token refresh duration
      */
     public static final String METRIC_TAG_REALM = "realm";
+
+    /**
+     * Flux CD config media type
+     */
+    public static final String FLUX_CD_CONFIG_MEDIA_TYPE = "application/vnd.cncf.flux.config.v1+json";
+
+    /**
+     * Flux CD content media type
+     */
+    public static final String FLUX_CD_CONTENT_MEDIA_TYPE = "application/vnd.cncf.flux.content.v1.tar+gzip";
+
+    /**
+     * Helm config media type
+     */
+    public static final String HELM_CONFIG_MEDIA_TYPE = "application/vnd.cncf.helm.config.v1+json";
+
+    /**
+     * Helm content media type
+     */
+    public static final String HELM_CONTENT_MEDIA_TYPE = "application/vnd.cncf.helm.chart.content.v1.tar+gzip";
 }
diff --git a/src/test/java/land/oras/FluxCDITCase.java b/src/test/java/land/oras/FluxCDITCase.java
index 1c31fe39..1f02e035 100644
--- a/src/test/java/land/oras/FluxCDITCase.java
+++ b/src/test/java/land/oras/FluxCDITCase.java
@@ -49,8 +49,6 @@ void shouldAssembleArtifact() {
 
         // The compressed manifests
         Path archive = Paths.get("src/test/resources/archives").resolve("flux-manifests.tgz");
-        String configMediaType = "application/vnd.cncf.flux.config.v1+json";
-        String contentMediaType = "application/vnd.cncf.flux.content.v1.tar+gzip";
 
         Map<String, String> annotations = Map.of(
                 Const.ANNOTATION_REVISION, "@sha1:6d63912ed9a9443dd01fbfd2991173a246050079",
@@ -58,8 +56,8 @@ void shouldAssembleArtifact() {
                 Const.ANNOTATION_CREATED, Const.currentTimestamp());
 
         // Create objects
-        Config config = Config.empty().withMediaType(configMediaType);
-        Layer layer = Layer.fromFile(archive).withMediaType(contentMediaType);
+        Config config = Config.empty().withMediaType(Const.FLUX_CD_CONFIG_MEDIA_TYPE);
+        Layer layer = Layer.fromFile(archive).withMediaType(Const.FLUX_CD_CONTENT_MEDIA_TYPE);
         Manifest manifest =
                 Manifest.empty().withConfig(config).withLayers(List.of(layer)).withAnnotations(annotations);
 
diff --git a/src/test/java/land/oras/HelmITCase.java b/src/test/java/land/oras/HelmITCase.java
index 631fda11..786642cb 100644
--- a/src/test/java/land/oras/HelmITCase.java
+++ b/src/test/java/land/oras/HelmITCase.java
@@ -49,8 +49,6 @@ void shouldAssembleArtifact() {
 
         // The compressed manifests
         Path archive = Paths.get("src/test/resources/archives").resolve("jenkins-chart.tgz");
-        String configMediaType = "application/vnd.cncf.helm.config.v1+json";
-        String contentMediaType = "application/vnd.cncf.helm.chart.content.v1.tar+gzip";
 
         Map<String, String> annotations = Map.of(
                 Const.ANNOTATION_DESCRIPTION, "Test helm chart",
@@ -58,8 +56,8 @@ void shouldAssembleArtifact() {
                 Const.ANNOTATION_CREATED, Const.currentTimestamp());
 
         // Create objects
-        Config config = Config.empty().withMediaType(configMediaType);
-        Layer layer = Layer.fromFile(archive).withMediaType(contentMediaType);
+        Config config = Config.empty().withMediaType(Const.HELM_CONFIG_MEDIA_TYPE);
+        Layer layer = Layer.fromFile(archive).withMediaType(Const.HELM_CONTENT_MEDIA_TYPE);
         Manifest manifest =
                 Manifest.empty().withConfig(config).withLayers(List.of(layer)).withAnnotations(annotations);