Rivers Cuomo

Rivers Cuomo has used the Gibson Lightning Bolt 2" Nylon Strap throughout his career. The strap is also mentioned in his song "Back to the Shack." A user-uploaded photo on Contentstack shows him with the strap.

In this video, where Weezer performed "Say It Ain't So", you can see in a couple of shots Dunlop Tortex .50 picks attached to the pickguard.

He uses those picks in most of live shows, as you can see in this photo, when zoomed, it says "Jim Dunlop" and "Nylon", and the colour of the nylon matches the .60mm pick colour.

Rivers Cuomo uses the Perri's 2.5" Italian Leather Guitar Strap with Lightning Bolt for his acoustic guitars during solo performances. This strap is similar to the one he uses with his Warmoth Custom Stratocasters, as shown in a user-uploaded photo on Medium.

According to Weezerpedia, Rivers Cuomo primarily used Dunlop Nylon Standard 0.73mm Guitar Picks from 1992 to 1999.

A Reddit post by user Willtyrikos confirms that Rivers Cuomo uses Dunlop Nylon Standard 0.88mm Guitar Picks, as they obtained one of Rivers' used picks from a recent concert.

A Reddit post by user DJ_HardR confirms that Rivers Cuomo uses Dunlop Herco Flex 75 Nylon 1.01mm Guitar Picks, as they obtained one of his guitar picks at a concert.

In a photo posted on Instagram by Weezer, Rivers Cuomo is seen with seven Dunlop Tortex Standard 0.60mm Guitar Picks in a pickstand.