diff --git a/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/LogRecordFromDiskExporter.java b/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/LogRecordFromDiskExporter.java
index c26a383d6..6c38be04a 100644
--- a/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/LogRecordFromDiskExporter.java
+++ b/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/LogRecordFromDiskExporter.java
@@ -14,7 +14,7 @@
 import java.io.IOException;
 import java.util.concurrent.TimeUnit;
 
-public class LogRecordFromDiskExporter implements FromDiskExporter {
+public final class LogRecordFromDiskExporter implements FromDiskExporter {
 
   private final FromDiskExporterImpl<LogRecordData> delegate;
 
diff --git a/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/LogRecordToDiskExporter.java b/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/LogRecordToDiskExporter.java
index 665e90f76..1524723e8 100644
--- a/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/LogRecordToDiskExporter.java
+++ b/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/LogRecordToDiskExporter.java
@@ -18,7 +18,8 @@
  * This class implements a {@link LogRecordExporter} that delegates to an instance of {@code
  * ToDiskExporter<LogRecordData>}.
  */
-public class LogRecordToDiskExporter implements LogRecordExporter {
+public final class LogRecordToDiskExporter implements LogRecordExporter {
+
   private final ToDiskExporter<LogRecordData> delegate;
 
   /**
diff --git a/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/MetricFromDiskExporter.java b/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/MetricFromDiskExporter.java
index 8bb4f3dcd..36d478e7b 100644
--- a/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/MetricFromDiskExporter.java
+++ b/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/MetricFromDiskExporter.java
@@ -14,7 +14,7 @@
 import java.io.IOException;
 import java.util.concurrent.TimeUnit;
 
-public class MetricFromDiskExporter implements FromDiskExporter {
+public final class MetricFromDiskExporter implements FromDiskExporter {
 
   private final FromDiskExporterImpl<MetricData> delegate;
 
diff --git a/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/MetricToDiskExporter.java b/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/MetricToDiskExporter.java
index 83d2fc73c..2e0848684 100644
--- a/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/MetricToDiskExporter.java
+++ b/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/MetricToDiskExporter.java
@@ -21,7 +21,7 @@
  * This class implements a {@link MetricExporter} that delegates to an instance of {@code
  * ToDiskExporter<MetricData>}.
  */
-public class MetricToDiskExporter implements MetricExporter {
+public final class MetricToDiskExporter implements MetricExporter {
 
   private final ToDiskExporter<MetricData> delegate;
   private final AggregationTemporalitySelector aggregationTemporalitySelector;
diff --git a/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/SpanFromDiskExporter.java b/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/SpanFromDiskExporter.java
index e3c7992ba..9523c8a2f 100644
--- a/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/SpanFromDiskExporter.java
+++ b/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/SpanFromDiskExporter.java
@@ -14,7 +14,7 @@
 import java.io.IOException;
 import java.util.concurrent.TimeUnit;
 
-public class SpanFromDiskExporter implements FromDiskExporter {
+public final class SpanFromDiskExporter implements FromDiskExporter {
 
   private final FromDiskExporterImpl<SpanData> delegate;
 
diff --git a/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/SpanToDiskExporter.java b/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/SpanToDiskExporter.java
index d5ca81518..dcd79d3b0 100644
--- a/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/SpanToDiskExporter.java
+++ b/disk-buffering/src/main/java/io/opentelemetry/contrib/disk/buffering/SpanToDiskExporter.java
@@ -18,7 +18,7 @@
  * This class implements a SpanExporter that delegates to an instance of {@code
  * ToDiskExporter<SpanData>}.
  */
-public class SpanToDiskExporter implements SpanExporter {
+public final class SpanToDiskExporter implements SpanExporter {
 
   private final ToDiskExporter<SpanData> delegate;