Those are IDV heads. They're slightly too small, made of a fairly hard foam, and VERY heavy. No USA LARP that I know of has found them acceptable, although they've done an unprecedented amount of scientific testing to try to show that they're eye-safe.
They're 50mm, which is just under 2". Actually if you put your forefinger on your brow bone and thumb on your cheekbone, you'll generally find something would need to be under 1" to "go in".
Ruleswise, the diameter is slightly undersized, and the rounded front won't comply with Dag/Bel rules.
Personally I think Dag/Bel has absolutely gone the wrong way with their protrusion rules, they don't make an arrow safer. But, there's a lot about the IDV design I don't like outside of that.
IDV did try to make some 2.5" flat-faced arrows for the USA market. They're craptastically wrong, IMHO. The original design used a really heavy, high density foam so it could hold together without a cover or tape and that was heavy in 2" dia and became REALLY heavy in 2.5". Then they added open-cell which isn't actually functional (too soft for a low-speed, high-momentum impact) and flat-faced to to Dag/Bel's strange rules concepts.
So it ended up largely defeating the original design concept and added in nonfunctional design features to comply with all the weird rules concepts. It ends up very heavy and draggy, kind of expensive for the tech ($15), only rated for 30lb bows absolute max, and don't have a cover so they'd still need to be finished to be legal.