What type of plastic are these made out of?

Typical plastic gears. Not a hard rubber. Good to have if you ever need a backup.

What size hole is in the gears? Are they all the same?

they vary from.0625 or 1/16 to .115 or 2.875mm that not any standard everything is +or- .003 there is no standard that they match,the plus or minus .003 is the test on my parts that i have

i need a double gear with 22 teeth at 14mm diameter and 12teeth at 10mm do you have please?

Hi thanks for your question. This is link of the size and specification of each gear → https://mega.nz/#F!BdpFVaZA!QzSstICCpv1_ZAt5UIaAPQ Any other question please feel free to contact us through email kuyiuss@outlook.com. We will always happy to help you out. Thank you!

ddoes this work for a goovi d380 ?

Hi, thanks for your question. This is the the size and specifications of each gear. Please have a look. https://mega.nz/#F!BdpFVaZA!QzSstICCpv1_ZAt5UIaAPQ

Plastic Gear Set 75pcs Single Double Reduction Gear Worm Gear

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Description

⚙️ Unlock your DIY genius with the ultimate gear set!

DIVERSE GEAR TYPES INCLUDED - Single, double reduction, crown, worm, spindle gears plus belts and pulleys for ultimate customization.
COMPLETE 75 PIECE GEAR ARSENAL - Everything you need for complex DIY robotics and car projects in one kit.
IDEAL FOR STEM MAKER CULTURE - Perfect for labs, classrooms, and hobbyists pushing the boundaries of DIY innovation.
PRECISION FIT FOR SMOOTH OPERATION - Tightly and loosely fitted gears with 2mm axle compatibility ensure flawless rotation.
READY TO BUILD RIGHT OUT OF THE BOX - Comprehensive assortment lets you start your next project immediately—no extra parts needed.

The AUKUYEE QY12 Plastic Gear Set offers 75 high-quality plastic gears and transmission parts, including single and double reduction gears, crown gears, worm gears, belts, and pulleys. Designed for DIY car and robot projects, this kit features precise 2mm axle fittings with both tight and loose options, making it ideal for STEM education, hobbyists, and model makers seeking a comprehensive, ready-to-use gear collection.

Specifications

ASIN	B06XCG24HZ
Best Sellers Rank	#82,895 in Toys & Games ( See Top 100 in Toys & Games ) #15 in Toy Interlocking Gear Sets
Brand Name	AUKUYEE
Customer Reviews	4.1 4.1 out of 5 stars (342)
Included Components	GEARS
Manufacturer	AUKUYEE
Material Type	Plastic
Model	QY12
Part Number	QY12

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- Plastic Gear Set, 75Pcs Single Double Reduction Gear Worm Gear for DIY Car Robot QY12

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