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

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⚙️ Gear up your genius—build smarter, faster, better!

VERSATILE 75 PIECE GEAR KIT - Unlock endless creativity with a comprehensive set perfect for cars, robots, and motors.
LIGHTWEIGHT DURABLE PLASTIC - Engineered for easy handling and long-lasting performance in all your DIY builds.
PRECISION WORM GEARS INCLUDED - Experience smooth, efficient torque transfer with single and double reduction worm gears.
NO ASSEMBLY OR BATTERIES NEEDED - Get started immediately—no extra parts or power sources required.
IDEAL FOR YOUNG INNOVATORS PROS - Recommended for ages 3+, perfect for hobbyists and professional tinkerers alike.

The AUKUYEE Plastic Gear Set includes 75 durable plastic gears featuring single and double reduction worm gears, designed for smooth torque control in DIY cars, robots, and motor projects. Lightweight and ready to use with no assembly or batteries required, this kit is ideal for hobbyists and young innovators aged 3 and up.

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Product Dimensions	5.08 x 10.16 x 5.08 cm; 68 g
Manufacturer recommended age	36 months - 8 years
Item model number	QY12
Assembly Required	No
Batteries Required?	No
Batteries Included?	No
Material Type(s)	Plastic
ASIN	B06XCG24HZ

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

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