diff --git a/grpclb/src/main/java/io/grpc/grpclb/GrpclbConstants.java b/grpclb/src/main/java/io/grpc/grpclb/GrpclbConstants.java
index 535f4f0ab4..5c08bb2804 100644
--- a/grpclb/src/main/java/io/grpc/grpclb/GrpclbConstants.java
+++ b/grpclb/src/main/java/io/grpc/grpclb/GrpclbConstants.java
@@ -33,6 +33,7 @@ package io.grpc.grpclb;
 
 import io.grpc.Attributes;
 import io.grpc.ExperimentalApi;
+import io.grpc.Metadata;
 
 /**
  * Constants for the GRPCLB load-balancer.
@@ -61,5 +62,12 @@ public final class GrpclbConstants {
   public static final Attributes.Key<String> ATTR_LB_ADDR_AUTHORITY =
       Attributes.Key.of("io.grpc.grpclb.lbAddrAuthority");
 
+  /**
+   * The opaque token given by the remote balancer for each returned server address.  The client
+   * will send this token with any requests sent to the associated server.
+   */
+  public static final Metadata.Key<String> TOKEN_METADATA_KEY =
+      Metadata.Key.of("lb-token", Metadata.ASCII_STRING_MARSHALLER);
+
   private GrpclbConstants() { }
 }
diff --git a/grpclb/src/main/java/io/grpc/grpclb/GrpclbLoadBalancer.java b/grpclb/src/main/java/io/grpc/grpclb/GrpclbLoadBalancer.java
index d646e361a3..f168d512e3 100644
--- a/grpclb/src/main/java/io/grpc/grpclb/GrpclbLoadBalancer.java
+++ b/grpclb/src/main/java/io/grpc/grpclb/GrpclbLoadBalancer.java
@@ -95,10 +95,6 @@ class GrpclbLoadBalancer extends LoadBalancer implements WithLogId {
   private static final Attributes.Key<AtomicReference<ConnectivityStateInfo>> STATE_INFO =
       Attributes.Key.of("io.grpc.grpclb.GrpclbLoadBalancer.stateInfo");
 
-  @VisibleForTesting
-  static final Metadata.Key<String> TOKEN_KEY =
-      Metadata.Key.of("lb-token", Metadata.ASCII_STRING_MARSHALLER);
-
   @VisibleForTesting
   static final RoundRobinEntry DROP_ENTRY =
       new RoundRobinEntry(Status.UNAVAILABLE.withDescription("Drop requested by balancer"));
@@ -548,8 +544,8 @@ class GrpclbLoadBalancer extends LoadBalancer implements WithLogId {
 
     void updateHeaders(Metadata headers) {
       if (token != null) {
-        headers.discardAll(TOKEN_KEY);
-        headers.put(TOKEN_KEY, token);
+        headers.discardAll(GrpclbConstants.TOKEN_METADATA_KEY);
+        headers.put(GrpclbConstants.TOKEN_METADATA_KEY, token);
       }
     }
 
diff --git a/grpclb/src/test/java/io/grpc/grpclb/GrpclbLoadBalancerTest.java b/grpclb/src/test/java/io/grpc/grpclb/GrpclbLoadBalancerTest.java
index 7b3ef57968..0dfae3458e 100644
--- a/grpclb/src/test/java/io/grpc/grpclb/GrpclbLoadBalancerTest.java
+++ b/grpclb/src/test/java/io/grpc/grpclb/GrpclbLoadBalancerTest.java
@@ -291,30 +291,30 @@ public class GrpclbLoadBalancerTest {
     when(args1.getHeaders()).thenReturn(headers1);
     assertSame(r1.result, picker.pickSubchannel(args1));
     verify(args1).getHeaders();
-    assertFalse(headers1.containsKey(GrpclbLoadBalancer.TOKEN_KEY));
+    assertFalse(headers1.containsKey(GrpclbConstants.TOKEN_METADATA_KEY));
 
     PickSubchannelArgs args2 = mock(PickSubchannelArgs.class);
     Metadata headers2 = new Metadata();
     // The existing token on the headers will be replaced
-    headers2.put(GrpclbLoadBalancer.TOKEN_KEY, "LBTOKEN__OLD");
+    headers2.put(GrpclbConstants.TOKEN_METADATA_KEY, "LBTOKEN__OLD");
     when(args2.getHeaders()).thenReturn(headers2);
     assertSame(r2.result, picker.pickSubchannel(args2));
     verify(args2).getHeaders();
-    assertThat(headers2.getAll(GrpclbLoadBalancer.TOKEN_KEY)).containsExactly("LBTOKEN0001");
+    assertThat(headers2.getAll(GrpclbConstants.TOKEN_METADATA_KEY)).containsExactly("LBTOKEN0001");
 
     PickSubchannelArgs args3 = mock(PickSubchannelArgs.class);
     Metadata headers3 = new Metadata();
     when(args3.getHeaders()).thenReturn(headers3);
     assertSame(r3.result, picker.pickSubchannel(args3));
     verify(args3).getHeaders();
-    assertThat(headers3.getAll(GrpclbLoadBalancer.TOKEN_KEY)).containsExactly("LBTOKEN0002");
+    assertThat(headers3.getAll(GrpclbConstants.TOKEN_METADATA_KEY)).containsExactly("LBTOKEN0002");
 
     PickSubchannelArgs args4 = mock(PickSubchannelArgs.class);
     Metadata headers4 = new Metadata();
     when(args4.getHeaders()).thenReturn(headers4);
     assertSame(r1.result, picker.pickSubchannel(args4));
     verify(args4).getHeaders();
-    assertFalse(headers4.containsKey(GrpclbLoadBalancer.TOKEN_KEY));
+    assertFalse(headers4.containsKey(GrpclbConstants.TOKEN_METADATA_KEY));
 
     verify(subchannel, never()).getAttributes();
   }