Long-wearing, general scrub rotary brushes. .012 soft bristles for light general scrubbing, available in 11" - 20" diameter showerfeed blocks with 1 3/4" trim. .028" stiff bristles for general scrubbing, available in 10" - 20" diameter showerfeed blocks with 1 3/4" trim. .022 medium bristles for light general scrubbing, available in 11" - 20" diameter showerfeed blocks. .032 heavy bristles, available in 11" - 20" diameter showerfeed blocks.