diff --git a/src/ntops/kernels/element_wise.py b/src/ntops/kernels/element_wise.py
index 4ed3c10..05aae1e 100644
--- a/src/ntops/kernels/element_wise.py
+++ b/src/ntops/kernels/element_wise.py
@@ -1,12 +1,12 @@
 import ninetoothed
 
 
-def arrangement(*tensors):
+def arrangement(*tensors, block_size=ninetoothed.block_size()):
     ndim = max(tensor.ndim for tensor in tensors)
 
     assert all(tensor.ndim == ndim or tensor.ndim == 0 for tensor in tensors)
 
-    block_shape = tuple(1 for _ in range(ndim - 1)) + (ninetoothed.block_size(),)
+    block_shape = tuple(1 for _ in range(ndim - 1)) + (block_size,)
 
     return tuple(
         tensor.tile(block_shape) if tensor.ndim != 0 else tensor for tensor in tensors