Yes, Sparkfun, legendary house of metallurgy.
This is just another of a great number of lead-free solders. One that subs in toxic antimony for toxic lead, by the way.
I find it odd that the product page doesn't say whether the alloy is eutectic. Also, it mentions water-soluble flux as though it is purely a virtue, when in fact it's a warning sign: you must clean that sort of flux off your boards, because it is caustic.
(Reminds me of the "triple organic" sign...