HOMBERKING 20 Pieces Glass Meal Prep Container Set (10 lids & 10 containers) Package Content: 10 PCS Lids 10 PCS of 630 ml Rectangle Glass Container, 6.9"x5.2"x2.5", 22oz (2.7cup) Our containers are made of safe and environmentally friendly material: The main body of the container - Transparent borosilicate glass The lid of the container - BPA-Free plastic Snap Locking Lids & Blue silicone sealing strip They can be used from -4? – 752? (-20? – 400?). Oven safe(Not the lids) Microwave safe(Not the lids) Freezer safe Dishwasher safe(Not the lids) Tips: 1. In order to prevent the rubber seal strips sticking to the glass containers, please make sure wash and wipe dry the lids and glass containers before put them away. 2. It is safe to wash the lids in the dishwasher, but high temperatures over a long period of time can deform the rubber seal strips at the edge of the lids. In order to extend service life of rubber seal strips, please wash the lids by hands as much as possible. 3. If you have any questions, please feel free to contact us.We'll get back to you in 24 hours.