Race Tech Heavy spring for Kawasaki KLX140L/G (16/19 & 18/21 wheels).  We have spec'd these springs out for the less aggressive riders or lighter riders.  A BBR HD spring for example is 6.2KG so these are a little softer than the BBR spring but still much heavier than the stock spring. 

Also fits: Honda CRF150R Shock and CR80/CR85 Shocks. 

Does not fit the KLX140R (14/17 wheels) stock shock without piggyback.