Lazy-L-SpreadersTM disposable microbiological spreaders provide an economical alternative to bending glass rods or pipets for spreading samples on agar surfaces and filters in Petri dishes. They are supplied sterile -- no need to flame sterilize or autoclave.unlike glass spreaders, durable polystyrene Lazy-L spreaders are non-breakable and pose no safety hazard L-shaped for convenient "lazy" spreading; just turn the Petri dish for smooth, even sample distribution smooth spreading surface and a slight upward turn reduce the chance that the spreader will dig into agar packaged in presterilized pouches of one or 10 each presterilization eliminates flaming or autoclaving and reduces risk of contamination no more time spent bending glass rods or waiting for glass or metal spreaders to cool before use!