The construction is basic - so basic that when my husband first gifted the set to me, I was skeptical that they'd last longer than a month. The body is hard molded plastic with a clear plastic window set in the lid. Rather than twisting or snapping on, the lid slides snugly over the body. The magnet glued to the underside is nearly the entire diameter of the cup itself.
Obviously, these jars exceeded my expectations. I have dropped them on the floor countless times, and the lids have never come off, the bodies have never cracked, and the magnets have stayed firmly fixed to the bottoms. Surprisingly given this, the lids are actually very easy to slip off when I need a pinch of spices while cooking. The jars hold about 1/3 cup of spice and are deep enough to allow me to scoop with a tablespoon measure.
The magnets hold even the fullest jars securely against whatever magnetic surface I stick them to. I love being able to pluck the jars that I need off the fridge and then stick them right back when I'm finished. In my current kitchen, these jars make excellent use of the small strip of fridge wall that sticks out beyond the cupboard.
My spice jars were made by Lipper and are available on Amazon. You can also find similar magnetic jars made of both plastic and glass (like these cute jars) sold at many kitchenware dealers:
• Lipper Store & See Containers, $17.50 from Amazon (Set of 5) • Zevro Zero-Gravity Spice Rack, $25 from Amazon.com (Set of 6) • Kamenstein Magnetic Spice Rack, $19.99 from Bed Bath & Beyond (Set of 6)
(Image: Emma Christensen)