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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Description

⚙️ Unlock your inner engineer with the ultimate gear set!

DIVERSE GEAR TYPES - From single to double, crown to worm gears—engineer complex mechanisms effortlessly.
COMPACT ORGANIZED - Neatly sized at just 5x10x5 cm, fits perfectly in your workspace or toolkit.
LIGHTWEIGHT DURABLE - High-quality plastic ensures long-lasting performance without the bulk.
PERFECT FOR DIY STEM - Ideal for robotics, model cars, and educational experiments—boost your creative edge.
COMPLETE 75 PIECE GEAR SET - All essential gears in one sleek package for your next innovation.

The AUKUYEE QY12 Plastic Gear Set offers 75 high-quality plastic gears and transmission parts, including single, double, crown, worm, bevel gears, and belts. Designed for DIY enthusiasts, robotics, and educational projects, this compact and lightweight kit provides versatile components to build and experiment with mechanical models.

Specifications

Manufacturer	AUKUYEE
Part number	QY12
Item Weight	68 g
Product Dimensions	5.08 x 10.16 x 5.08 cm; 68 g
Is Discontinued By Manufacturer	No
Size	75pcs
Style	QY12-N
Material	プラスチック
Included Components	ギア
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	5.1 x 10.2 x 5.1 cm

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AUKUYEE プラスチックギアセット、75個シングルダブルリダクションギアウォームギア DIY 車ロボット QY12用

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AUKUYEE プラスチックギアセット、75個 シングル ダブル リダクション ギア ウォームギア DIY 車 ロボット QY12用

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AUKUYEE プラスチックギアセット、75個シングルダブルリダクションギアウォームギア DIY 車ロボット QY12用