What is the material of the rubber seal? I want to boil them to sterilize.

Appears to be, but you may want to have old timey rubber rings to be sure. I've never researched that

Are the hinges definitely made of stainless steel, or some other type of metal?

Shrug🤷 It’s metal and flimsy but works. The glass is definitely made out of silica……

Are they dish washer safe?

Yes. The material is glass with a metal fastener and plastic gasket. You should make sure the fastener does not get in the way of any moving part of the dishwasher.

What is the country of origin please?

They are sold by a company in China so I assume they are made in China.

CHEFSTORY 50oz Airtight Glass Jars with Lids, 3 PCS Food Storage Canister for Kitchen & Pantry Organization, Square Mason Jar Containers for Storing Sugar, Flour,Coffee,

CHEFSTORY 50oz Airtight Glass Jars with Lids, 3 PCS Food Storage Canister for Kitchen & Pantry Organization, Square Mason Jar Containers for Storing Sugar, Flour,Coffee,

Product ID: 380533078

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Details

Brand
CHEFSTORY
Colour
white
Material
Glass
Material Feature
BPA Free
Capacity
1.42 kg

🔒BPA-free airtight seal

🟫space-saving square design

🧊50oz airtight capacity

Description

🧺 Elevate your pantry game with airtight style and sustainable storage!

EFFORTLESS MAINTENANCE - Hand wash only for long-lasting clarity and durability—designed to keep your kitchen looking pristine.
SAFE SUSTAINABLE STORAGE - Crafted from BPA-free glass, these jars offer a non-toxic, eco-friendly alternative to plastic containers.
VERSATILE PANTRY POWERHOUSES - Perfectly sized 50oz jars ideal for storing a variety of staples from cereals to snacks, making organization effortless.
MAXIMIZE FRESHNESS MINIMIZE WASTE - Keep your pantry essentials like sugar, flour, and coffee fresher for longer with airtight lids that lock in flavor and aroma.
SLEEK SQUARE DESIGN FOR MODERN KITCHENS - Save precious shelf space and elevate your kitchen aesthetic with stylish, stackable square glass jars.

The CHEFSTORY 50oz Airtight Glass Jars come in a set of three square-shaped, BPA-free glass containers with airtight lids designed to preserve freshness and optimize kitchen organization. Each jar holds 50 fluid ounces, perfect for storing sugar, flour, coffee, and more, while their space-saving design and durable construction make them a must-have for any modern pantry.

Specifications

Product Dimensions	11.4L x 11.4W x 20.1H Centimeters
Recommended Uses For Product	Sugar, Flour, Cereal,Coffee,Cookies,Pasta,Beans,Candy,Snacks
Special Feature	Air Tight
Container shape	Square
Closure Type	Lid
Is Dishwasher Safe	No
Material Type Free	BPA Free
Item Package Quantity	3
Item Weight	5.93 Pounds
Product Care Instructions	Hand Wash Only
Item Volume	50 Fluid Ounces
Net Quantity	3 Count
Is Microwaveable	Yes
Item Form	jar, airtight lid
Manufacturer	glass
Specific Uses For Product	inside
Size	one size
Item model number	USCS03001
ASIN	B08KXRXQ8G

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€ 231.02

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