diff --git a/src/atomic.rs b/src/atomic.rs
index e588810..8944375 100644
--- a/src/atomic.rs
+++ b/src/atomic.rs
@@ -29,7 +29,7 @@ pub type AParseError<A> = <A as AtomicBase>::AParseError;
 pub type AParseResult<A> = Result<A, AParseError<A>>;
 
 /// [`Atomic`] base.
-pub trait AtomicBase: 'static + Send + Sync + Send + Clone + Serializable {
+pub trait AtomicBase: 'static + Send + Sync + Clone + Serializable {
     /// Equivalent of [`FactoryBase::ParseError`].
     ///
     /// [`FactoryBase::ParseError`]: crate::rcore::FactoryBase::ParseError
diff --git a/src/rstd/inlining/static_pair.rs b/src/rstd/inlining/static_pair.rs
index 55c9b81..08ed414 100644
--- a/src/rstd/inlining/static_pair.rs
+++ b/src/rstd/inlining/static_pair.rs
@@ -68,6 +68,7 @@ pub trait StaticPair<'a, Ctx: Context<'a>>:
 }
 
 /// Generic implementation of a [Mentionable] for [StaticPair]s.
+#[derive(Clone)]
 pub struct StaticPairObject<SP> {
     pair: SP,
 }
@@ -205,3 +206,24 @@ where
 {
     const SIZE: usize = SP::FA::SIZE + SP::FB::SIZE;
 }
+
+pub trait StaticPairAtomic:
+    'static + Send + Sync + Clone + Sized + StaticPairSerializable<SA = Self::A, SB = Self::B>
+{
+    /// First element's type. Must equal [`StaticPairSerializable::SA`].
+    type A: AtomicBase;
+    /// Second element's type. Must equal [`StaticPairSerializable::SB`].
+    type B: AtomicBase;
+
+    type AParseError: Error;
+    /// Construct the atomic from the elements.
+    fn from_parsed(a: Self::A, b: Self::B) -> Result<Self, Self::AParseError>;
+    /// Regularise the error returned while parsing the first element.
+    fn from_error_a(error: AParseError<Self::A>) -> Self::AParseError;
+    /// Regularise the error returned while parsing the second element.
+    fn from_error_b(error: AParseError<Self::B>) -> Self::AParseError;
+}
+
+impl<SP: StaticPairAtomic> AtomicBase for StaticPairObject<SP> {
+    type AParseError = SP::AParseError;
+}