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Masks made of 3 layers of high-quality non-woven fabric which is more breathable Our disposable face masks are suitable for adults and teenagers These face masks can be used for daily protection, but should not be used in surgical or high risk situations 100 pieces Great for dust-free workshops, schools, catering services, food processing, environmental cleaning, production workshop, public occasions, etc.

Erlenmeyer Flasks are designed with heavy duty rims to reduce chipping. Their uniform wall thickness provides the proper balance between mechanical strength and thermal shock resistance. Approximate graduations are in durable white enamel. An extra large marking space is also provided. (US Quarter for scale) **NOT INCLUDED** Contains 1 each 50, 150 and 250ml Flask High quality inert 3.3 borosilicate glass ASTM Specification E960, Type I requirements ID/OD: 50ml: 24.5/30.5mm, 150ml: 32/37mm, 250ml: 32/37.5mm.

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