Is the LEGO Gear Block Yellow (9918-1) rare?

Yes, as a single piece from the 1999 Technic theme, this item is considered a specialized collectible.

What is the theme and year of this LEGO set?

This piece belongs to the Technic theme and was released in the year 1999.

This item consists of only 1 piece.

Name: LEGO Gear Block Yellow (9918-1)
Brand: LEGO

Technic

Technic · 1999

Theme · TechnicPieces · 1Set Number · 9918-1Year · 1999

Used

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New / Sealed

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Is the LEGO Gear Block Yellow (9918-1) rare?: Yes, as a single piece from the 1999 Technic theme, this item is considered a specialized collectible.
What is the theme and year of this LEGO set?: This piece belongs to the Technic theme and was released in the year 1999.
How many pieces are in the LEGO Gear Block Yellow (9918-1)?: This item consists of only 1 piece.