Sfera Stin Kardia (Greek: Σφαίρα Στην Καρδιά; English: Bullet in the heart) is the fourth studio album of Greek artist, Mariada Pieridi.

[1][2] The following single was officially released to radio stations and made into music videos.

The songs "Den Eimai Ego", "S' Eho Anagki" and "Sfera Stin Kardia", despite not having been released as singles, managed to gain radio airplay with the following single.

The song is a laiko-pop uptempo track and had massive airplay.

Sfera Stin Kardia made its debut at number 15 on the 'Top 50 Greek Albums' charts by IFPI.