diff --git a/androscalpel_serializer/src/items/header.rs b/androscalpel_serializer/src/items/header.rs
new file mode 100644
index 0000000..36557f6
--- /dev/null
+++ b/androscalpel_serializer/src/items/header.rs
@@ -0,0 +1,33 @@
+//! The header item: https://source.android.com/docs/core/runtime/dex-format#header-item
+
+use crate::{DexFileMagic, EndianConstant};
+
+/// The header item: https://source.android.com/docs/core/runtime/dex-format#header-item
+#[derive(Serializable, PartialEq, Eq, Debug)]
+pub struct UserItem {
+    pub magic: DexFileMagic,
+    pub checksum: u32,
+    pub signature: [u8; 20],
+    pub file_size: u32,
+    pub header_size: u32, // should be = 0x70
+    pub endian_tag: EndianConstant,
+    pub link_size: u32, // should be 0
+    pub link_off: u32,  // should be 0
+    pub map_off: u32,
+    pub string_ids_size: u32,
+    pub string_ids_off: u32,
+    pub type_ids_size: u32, // At most 0xffff
+    pub type_ids_off: u32,
+    pub proto_ids_size: u32, // At most 0xffff
+    pub proto_ids_off: u32,
+    pub field_ids_size: u32,
+    pub field_ids_off: u32,
+    pub method_ids_size: u32,
+    pub method_ids_off: u32,
+    pub class_defs_size: u32,
+    pub class_defs_off: u32,
+    pub data_size: u32, // Must be an even multiple of sizeof(uint) -> % 8 = 0
+    pub data_off: u32,
+}
+
+// TODO: add checks
diff --git a/androscalpel_serializer/src/items/mod.rs b/androscalpel_serializer/src/items/mod.rs
new file mode 100644
index 0000000..5e5b83d
--- /dev/null
+++ b/androscalpel_serializer/src/items/mod.rs
@@ -0,0 +1,7 @@
+//! The items structures.
+
+pub mod header;
+pub mod map;
+
+pub use header::*;
+pub use map::*;