diff --git a/core/api/src/main/java/org/onosproject/net/pi/runtime/data/PiHeader.java b/core/api/src/main/java/org/onosproject/net/pi/runtime/data/PiHeader.java
new file mode 100644
index 0000000..bbc0f8e
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/pi/runtime/data/PiHeader.java
@@ -0,0 +1,108 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.net.pi.runtime.data;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+import com.google.common.collect.ImmutableList;
+import org.onlab.util.ImmutableByteSequence;
+import org.onosproject.net.pi.model.PiData;
+
+import java.util.List;
+import java.util.StringJoiner;
+
+/**
+ * Instance of a PiHeader in a protocol-independent pipeline.
+ */
+@Beta
+public final class PiHeader implements PiData {
+    private final Boolean isValid;
+    private final ImmutableList<ImmutableByteSequence> bitStrings;
+
+    /**
+     * Creates a new protocol-independent header instance.
+     *
+     * @param isValid whether the header is valid
+     * @param bitStrings bitstrings
+     */
+    private PiHeader(Boolean isValid, List<ImmutableByteSequence> bitStrings) {
+        this.isValid = isValid;
+        this.bitStrings = ImmutableList.copyOf(bitStrings);
+    }
+
+    /**
+     * Returns a new protocol-independent header.
+     * @param isValid whether the header is valid
+     * @param bitStrings bitstrings
+     * @return header
+     */
+    public static PiHeader of(Boolean isValid, List<ImmutableByteSequence> bitStrings) {
+        return new PiHeader(isValid, bitStrings);
+    }
+
+    /**
+     * Return whether the header is valid.
+     *
+     * @return bool
+     */
+    public Boolean isValid() {
+        return this.isValid;
+    }
+
+    /**
+     * Return the header bit strings.
+     *
+     * @return the list of bit string
+     */
+    public List<ImmutableByteSequence> bitStrings() {
+        return this.bitStrings;
+    }
+
+    @Override
+    public Type type() {
+        return Type.HEADER;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        PiHeader header = (PiHeader) o;
+        return Objects.equal(isValid, header.isValid) &&
+                Objects.equal(bitStrings, header.bitStrings);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(isValid, bitStrings);
+    }
+
+    @Override
+    public String toString() {
+        StringJoiner stringParams = new StringJoiner(", ", "(", ")");
+        this.bitStrings().forEach(p -> stringParams.add(p.toString()));
+        return MoreObjects.toStringHelper(getClass())
+                .add("bitString", stringParams)
+                .add("isValid", isValid)
+                .toString();
+    }
+}
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