Set consists of one each of 50, 100, 250, 400, 800, and 1000mL beakers. Tri-corner lip for dripless pouring. Unaffected by commonly used acids, alkalis and solvents. Sturdy enough for autoclaving and reuse, yet inexpensive enough to be disposable. Easy-to-read graduations are accurate to ±5.0%. Warning: Not for use on burners