Just had another look - at the refills available:
http://www.pilotpen.co.uk/products/index.php?size=&pos=18&search=Refills
Halfway down the page it lists the BLSGC4 as a " Refill for G-Tec-C4, Begreen Hi-Tec-C" so the refill is the same, and the case is slightly different (Begreen is recycled)
@GF started
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Just had another look - at the refills available:
http://www.pilotpen.co.uk/products/index.php?size=&pos=18&search=Refills
Halfway down the page it lists the BLSGC4 as a "
Refill for G-Tec-C4, Begreen Hi-Tec-C" so the refill is the same, and the case is slightly different (Begreen is recycled)