These syringes are latex free; contain no rubber, no silicone oil or styrene. They are the choice for any situation needing an inert, hypoallergenic syringe. Because of their purity, they are indicated for IVF, embryo transfer, chromatography and many laboratory procedures. Manufactured only from laboratory grade polypropylene and polyethylene, these unique plastic syringes have a positive safety stop to prevent accidental spills. These syringes are individually sterile strip packed.