U-Konserve's containers are made from 18/8 (#304) food grade stainless steel. Leak resistant container lids are made from #4 LDPE plastic – a low density polyethylene which is widely recyclable. All dividers are removable and are made from #5 PP plastic.
All containers have tare weight measurements etched onto the bottom.
The stainless steel containers are dishwasher safe, top rack recommended. Although the lids can be washed in the dishwasher, research has shown that it is best to keep plastics out of high temperature environments like microwaves and dishwashers.U-Konserve do not recommend that their plastic lids are used in the freezer because they do not react well to extreme temperatures, and the plastic may crack.