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Feature: Useful function: These clear scientific tubes and funnel adapters, cleaning brushes can be applied for scientific and lab experiments, which can provide help for your small experiments. Specifications: Material: glass Size: as shown in the picture Quantity: 12 pieces Color: as shown in the picture Package includes: 4 x Stem scientific tubes 4 x Clear funnel adapters 4 x Cleaning brushes Note: Manual measurement, please allow little size errors. Children should use these under the direct supervision of an adult.