T-shaped Spreader is sterile, available in polypropylene (flexible) and polystyrene (rigid) in different colors. Its base length (spreading part) is 36mm and it can be used across all Petri dishes. The special design of P.I.P. T-shaped Spreaders prevents any cutting or gouging of agar during inoculation of culture plates. It is also disposable and resistant to most of the common laboratory acids and chemicals.