Delta™: Uniquely shaped spreading bar has an innovative edgeless design no need to worry about tearing the agar. Made of ABS, sterile supplied. The delta-shaped head distributes pressure evenly for smooth spreading. - Disposable. L-shaped: Smooth surface will not tear agar plate or disturb media layer. Sterile supplied for immediate use without flaming. - Disposable. Delta™: Uniquely shaped spreading bar has an innovative edgeless design no need to worry about tearing the agar. Made of ABS, sterile supplied. The delta-shaped head distributes pressure evenly for smooth spreading. - Disposable. L-shaped: Smooth surface will not tear agar plate or disturb media layer. Sterile supplied for immediate use without flaming. - Disposable.