These bottles are made of high quality clear glass and comes fitted with translucent screw caps made from pharma-grade polypropylene (PP).  These disinfected bottles enables you to produce a large number of copies of any plant of your interest and in addition, aseptic propagation ensure that each new plant is sterile and free of pathogens and contaminants. These tissue culture bottles minimizes the possibility of genetic changes over time, compared to propagation from branches of a mother plant. Simply autoclave them and reuse them.