Welcome to the online home of MJC Ironworks.
tour-grade certified, high-performance strings.

There will never be anyone like him.

The Music Industry has lost one of the greatest bass players ever – whose influence, originality and creativity has helped so many bassists become better players. Rocco’s left of center approach helped shape the sound of Tower of Power. I was blessed to be a friend/brother for over 40 years… I have so many Rocco stories, and wonderful memories of my friend.

Rocco has survived so many major health issues over the last 40 years… it is inconceivable to me that he’s gone. He was a giant as a bass player, and all of us at MJC Ironworks are in shock and deeply saddened by his passing.

Rocco was a true, one of a kind, fun, hilarious, smart and articulate man as well. Anyone who knew him loved him. There are no words that will truly explain how we feel about his loss, or what a truly original person he was. My life will never be the same – it’s like losing your brother.

Rocco was so much more than just an endorsement for us here at MJC. He will be missed, but his outstanding contribution to the language of music, and his truly original approach to the groove, will echo for generations to come.

Our deepest condolences go out to his family… they were the pillar that gave him the strength to endure all that life threw at him.

Please stay tuned. We will doing some things to help his family with all the expenses that arise from this tragedy, and pay tribute to this great man.

The question – what is hip? The answer is, and will always be… Francis Rocco Prestia.

Rest in peace, brother.

Mike Connolly

“By far the best strings I’ve ever encountered…
I now string all my guitars with nothing but MJC Ironworks.”

Sammy Sanchez – guitar tech, luthier, musician

Partial Client List

Carlos Santana | Jackson Browne | George Benson | Keb Mo | Slash | Ben Harper | Bonnie Raitt | James Taylor


Why we’re better… and why it really matters.

There are a bunch of string companies out there… but we’re different.

Experience matters… and we’ve got a boatload.

Not just any old yahoo can make great strings.


Your strings shouldn’t be corroding

The proprietary technology we use in every package protects your strings.


We love artists… and they love us back – over and over.

When they find us, they stick with us. More every day.


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