Fullerin sarupa bentukna jeung struktur grafit, nu diwangun ku salambar cingcin héxagonal numbu, tapi cingcinnna péntagonal (atawa kadang héptagonal) nu nyegah lambaranana jadi planar. Fullerin nyolobong mindengna disebut tabungnano (nanotubes). The smallest fullerene in which no two pentagons share an edge (which is destabilizing — see pentalene) is C60 (buckminsterfullerene), and as such it is also the most common.