  We present the design, construction, and characterisation of longitudinal-
and transverse-field Zeeman slowers, based on arrays of permanent magnets, for
slowing thermal beams of atomic Sr. The slowers are optimised for operation
with deceleration related to the local laser intensity (by the parameter
$\epsilon$), which uses more effectively the available laser power, in contrast
to the usual constant deceleration mode. Slowing efficiencies of up to
$\approx$ $18$ $%$ are realised and compared to those predicted by modelling.
We highlight the transverse-field slower, which is compact, highly tunable,
light-weight, and requires no electrical power, as a simple solution to slowing
Sr, well-suited to spaceborne application. For $^{88}$Sr we achieve a slow-atom
flux of around $6\times 10^9$ atoms$\,$s$^{-1}$ at $30$ ms$^{-1}$, loading
approximately $5\times 10^8$ atoms in to a magneto-optical-trap (MOT), and
capture all isotopes in approximate relative natural abundances.
