I looked at the answers for this model (might not be your exact one), one customer mentioned that it came with a 6B lead.

One seller says that it comes with an HB lead, but I doubt it because I don't think the 5.6mm leads come in HB, only 2B,4B,6B and apparenly some non-graphite versions.

EDIT: the leads on that same page are actually 4B, so maybe that's what comes with the lead holder?