diff --git a/elastica/__init__.py b/elastica/__init__.py
index f705615a..21dfddb7 100644
--- a/elastica/__init__.py
+++ b/elastica/__init__.py
@@ -17,8 +17,6 @@
     GeneralConstraint,
     FixedConstraint,
     HelicalBucklingBC,
-    FreeRod,
-    OneEndFixedRod,
 )
 from elastica.external_forces import (
     NoForces,
diff --git a/elastica/boundary_conditions.py b/elastica/boundary_conditions.py
index 66680e2d..ad1a35cd 100644
--- a/elastica/boundary_conditions.py
+++ b/elastica/boundary_conditions.py
@@ -1,6 +1,6 @@
 __doc__ = """ Built-in boundary condition implementationss """
 
-import warnings
+pass
 from typing import Any, Optional, TypeVar, Generic
 
 import numpy as np
@@ -238,15 +238,6 @@ def compute_constrain_rates(
         omega_collection[..., 0] = 0.0
 
 
-class OneEndFixedRod(OneEndFixedBC):
-    # Please clear this part beyond version 0.3.0
-    """Deprecated 0.2.1: Same implementation as OneEndFixedBC"""
-    warnings.warn(
-        "OneEndFixedRod is deprecated and renamed to OneEndFixedBC. The deprecated name will be removed in the future.",
-        DeprecationWarning,
-    )
-
-
 class GeneralConstraint(ConstraintBase):
     """
     This boundary condition class allows the specified node/link to have a configurable constraint.
diff --git a/elastica/joint.py b/elastica/joint.py
index 038ac256..2788b501 100644
--- a/elastica/joint.py
+++ b/elastica/joint.py
@@ -1,8 +1,6 @@
 __doc__ = """ Module containing joint classes to connect multiple rods together. """
 __all__ = ["FreeJoint", "HingeJoint", "FixedJoint", "get_relative_rotation_two_systems"]
 
-pass
-
 from elastica._rotations import _inv_rotate
 from elastica.typing import SystemType, RodType, ConnectionIndex, RigidBodyType
 
diff --git a/elastica/reset_functions_for_block_structure/_reset_ghost_vector_or_scalar.py b/elastica/reset_functions_for_block_structure/_reset_ghost_vector_or_scalar.py
index 4af0cd59..18e5d129 100644
--- a/elastica/reset_functions_for_block_structure/_reset_ghost_vector_or_scalar.py
+++ b/elastica/reset_functions_for_block_structure/_reset_ghost_vector_or_scalar.py
@@ -1,6 +1,6 @@
 __doc__ = """Reset the ghost vectors or scalar variables using functions implemented in Numba"""
 
-import numpy
+import numpy as np
 from numpy.typing import NDArray
 from numba import njit
 
diff --git a/elastica/rigidbody/sphere.py b/elastica/rigidbody/sphere.py
index 38aaf23d..b7797ceb 100644
--- a/elastica/rigidbody/sphere.py
+++ b/elastica/rigidbody/sphere.py
@@ -41,7 +41,7 @@ def __init__(
         assert base_radius > 0.0, "base_radius must be positive"
         assert density > 0.0, "density must be positive"
 
-        self.radius = np.float64(base_radiu)
+        self.radius = np.float64(base_radius)
         self.density = np.float64(density)
         self.length = np.float64(2 * base_radius)
         # This is for a rigid body cylinder