diff --git a/api/src/main/java/openconsensus/metrics/NoopMetrics.java b/api/src/main/java/openconsensus/metrics/NoopMetrics.java
index 8502bb7e81..b5bb0ef015 100644
--- a/api/src/main/java/openconsensus/metrics/NoopMetrics.java
+++ b/api/src/main/java/openconsensus/metrics/NoopMetrics.java
@@ -26,16 +26,21 @@ import openconsensus.metrics.data.LabelKey;
 import openconsensus.metrics.data.LabelValue;
 import openconsensus.metrics.data.Metric;
 
-/** No-op implementations of metrics classes. */
-final class NoopMetrics {
+/**
+ * No-op implementations of metrics classes.
+ *
+ * @since 0.1.0
+ */
+public final class NoopMetrics {
   private NoopMetrics() {}
 
   /**
    * Returns an instance that contains no-op implementations for all the instances.
    *
    * @return an instance that contains no-op implementations for all the instances.
+   * @since 0.1.0
    */
-  static MetricsComponent newNoopMetricsComponent() {
+  public static MetricsComponent newNoopMetricsComponent() {
     return new NoopMetricsComponent();
   }
 
diff --git a/api/src/main/java/openconsensus/stats/NoopStats.java b/api/src/main/java/openconsensus/stats/NoopStats.java
index 71ee3db083..72259afe9b 100644
--- a/api/src/main/java/openconsensus/stats/NoopStats.java
+++ b/api/src/main/java/openconsensus/stats/NoopStats.java
@@ -27,8 +27,12 @@ import openconsensus.stats.view.ViewManager;
 import openconsensus.stats.view.data.View;
 import openconsensus.tags.TagMap;
 
-/** No-op implementations of stats classes. */
-final class NoopStats {
+/**
+ * No-op implementations of stats classes.
+ *
+ * @since 0.1.0
+ */
+public final class NoopStats {
 
   private NoopStats() {}
 
@@ -36,8 +40,9 @@ final class NoopStats {
    * Returns a {@code StatsRecorder} that is no-op implementation for {@link StatsRecorder}.
    *
    * @return a {@code StatsRecorder} that is no-op implementation for {@code StatsRecorder}.
+   * @since 0.1.0
    */
-  static StatsRecorder newNoopStatsRecorder() {
+  public static StatsRecorder newNoopStatsRecorder() {
     return new NoopStatsRecorder();
   }
 
@@ -45,8 +50,9 @@ final class NoopStats {
    * Returns a {@code ViewComponent} that has a no-op implementation for {@link ViewManager}.
    *
    * @return a {@code ViewComponent} that has a no-op implementation for {@code ViewManager}.
+   * @since 0.1.0
    */
-  static ViewComponent newNoopViewComponent() {
+  public static ViewComponent newNoopViewComponent() {
     return new NoopViewComponent();
   }
 
diff --git a/api/src/main/java/openconsensus/tags/NoopTags.java b/api/src/main/java/openconsensus/tags/NoopTags.java
index 447821a245..3c76581c4c 100644
--- a/api/src/main/java/openconsensus/tags/NoopTags.java
+++ b/api/src/main/java/openconsensus/tags/NoopTags.java
@@ -28,8 +28,12 @@ import openconsensus.tags.data.TagValue;
 import openconsensus.tags.propagation.BinaryFormat;
 import openconsensus.tags.propagation.TextFormat;
 
-/** No-op implementations of tagging classes. */
-final class NoopTags {
+/**
+ * No-op implementations of tagging classes.
+ *
+ * @since 0.1.0
+ */
+public final class NoopTags {
 
   private NoopTags() {}
 
@@ -37,8 +41,9 @@ final class NoopTags {
    * Returns a {@code Tagger} that is a no-op implementation for {@link Tagger}.
    *
    * @return a {@code Tagger} that is a no-op implementation for {@link Tagger}.
+   * @since 0.1.0
    */
-  static Tagger newNoopTagger() {
+  public static Tagger newNoopTagger() {
     return new NoopTagger();
   }
 
diff --git a/api/src/main/java/openconsensus/trace/NoopTrace.java b/api/src/main/java/openconsensus/trace/NoopTrace.java
index 6ce73a7d76..ce251c271b 100644
--- a/api/src/main/java/openconsensus/trace/NoopTrace.java
+++ b/api/src/main/java/openconsensus/trace/NoopTrace.java
@@ -27,9 +27,12 @@ import openconsensus.trace.data.SpanData;
 import openconsensus.trace.propagation.BinaryFormat;
 import openconsensus.trace.propagation.TextFormat;
 
-/** No-op implementations of trace classes. */
-// TODO(Issue #65): decide whether this class should be public or not.
-final class NoopTrace {
+/**
+ * No-op implementations of trace classes.
+ *
+ * @since 0.1.0
+ */
+public final class NoopTrace {
 
   private NoopTrace() {}
 
@@ -37,8 +40,9 @@ final class NoopTrace {
    * Returns a {@code Tracer} instance that is no-op implementations.
    *
    * @return a {@code Tracer} instance that is no-op implementations.
+   * @since 0.1.0
    */
-  static Tracer newNoopTracer() {
+  public static Tracer newNoopTracer() {
     return new NoopTracer();
   }