Is the 5003160-1 set still popular for Technic builds?

Yes, as a 2014 Technic item, these parts are sought after by collectors and builders needing specific components.

What is the general condition I should expect for this 2014 piece?

Since the facts do not specify condition, buyers should inquire about the exact state of the 100 pieces.

While the set is from 2014, the specific axles are common building elements within the larger Technic theme.

Name: LEGO 2 Stud Axles with Grooves (Red) (5003160-1)
Brand: LEGO

Technic

Technic · 2014

Theme · TechnicPieces · 100Set Number · 5003160-1Year · 2014

Used

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New / Sealed

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Live on eBay now

Converted from USD at the ECB reference rate — sold comps are US-market sales.

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Is the 5003160-1 set still popular for Technic builds?: Yes, as a 2014 Technic item, these parts are sought after by collectors and builders needing specific components.
What is the general condition I should expect for this 2014 piece?: Since the facts do not specify condition, buyers should inquire about the exact state of the 100 pieces.
Is this piece rare within the Technic theme?: While the set is from 2014, the specific axles are common building elements within the larger Technic theme.