Youngy Electronic Component Storage Box, 9Pieces/Set SMD Container SMT IC Electronic Component Mini Storage Box Jewelry Case

I wish they were easier to interlock and move around, but the opening and closing mechanism works well, and they've never popped open on me when they shouldn't.

The boxes are made of a good plastic material.However, half the lids do not spring open as designed.When placed together as illustrated, it is not possible to pry the lids open without a tiny screwdriver each time.It appears that the adjacent box interferes with the lid, causing the product to be un-usable.