In fact, these Spider-Man and Iron Man sets appear to be the first where Lego has specifically referred to them as busts.

Lego's upcoming Spider-Man display model for adults celebrates the awesome Iron Spider costume from Marvel's Avengers movies.

A new line of Lego Marvel mini-busts has been unveiled, with the first two characters being Iron Spider-Man and Iron Man MK4.

A new collection of LEGO sets have been revealed as the Marvel Cinematic Universe comes to life in brick bust form ...

so LEGO is going smaller. They’ve unveiled two new sets for Marvel fans – the Iron Man MK4 Bust (#76327) and the Iron Spider-Man Bust (#76326), which include only 436 and 379 pieces respectively.