Seb Barlow

In this post seb talks about the basses he uses. He states that he always used fender p basses but more recently started playing jazz basses as well

In the video for lowlife by neck deep, seb can be seen playing a fender jazz bass

At 4:04 you can see when the bass tech brings him the bass, and you can tell is a Mark Hoppus Surf Green because of the Jazz Shape and the inverted P Bass pickups like Mark normally uses. At 4:08 you can see a better shot of it, with the full pearloid Jazz Bass pickguard, and only 1 volume knob. He actually uses it for the full performance of Fall

For this live in quarantine performance, seb can be seen using a fender jaguar bass

Seb Barlow uses a custom Fender Jaguar Bass, as evidenced by his Instagram post. The bass features a Jaguar body with a Jazz neck, crafted by Allan Corona, and is finished in Jungle Green. It includes unique artwork based on doodles Seb previously shared on his Instagram story. The instrument is equipped with a Seymour Duncan Quarter Pound SPB-3 inverted precision pickup in the neck position and an SJB-3 bridge pickup. Seb expressed his gratitude for the thoughtful gift in his post, stating, "Truly the most generous and thoughtful gift I’ve ever received!"