Specification Brand : Dntum BulletPoint1 : The product is a three-dimensional magnified model of sub-microscopic structure, including ring ducts, threaded ducts, reticulated ducts, perforated ducts and screens; BulletPoint2 : Ring, thread, and reticulated ducts show at least one intermolecular boundary, sieve and perforated ducts show one molecule, one side of the sieve shows companion cells, and at the same time, the sieve plate and sieve holes are shown on the ducts to show secondary walls, pits, etc. BulletPoint3 : Ring catheter 4×25cm; reticulated catheter 50×25cm; sieve guide 40×25cm threaded catheter 4x25cm perforated catheter 60×25cm BulletPoint4 : This model is suitable for use as an intuitive teaching aid when explaining the structure of catheter screens in botany in middle schools and colleges. BulletPoint5 : After use, put on a plastic cover and store it in a ventilated, dark, and dry place. If it is dirty, it is recommended to wash it with a cotton cloth moistened with water. Color : Silver ExternallyAssignedProductIdentifier : 7071545113619 ItemDisplayDimensions_Height : 2.17 centimeters ItemDisplayDimensions_Length : 7.87 centimeters ItemDisplayDimensions_Width : 7.87 centimeters ItemDisplayWeight : 0.42 grams ItemName : Dntum Sieve Tube Structure Model, Teaching Instrument Catheter, Three-Dimensional Magnified Model of Microstructure, Used for Junior High School and High School Biological Experiment Equipment ItemPackageDimensions_Height : 2.36 inches ItemPackageDimensions_Length : 8.27 inches ItemPackageDimensions_Width : 8.27 inches ItemPackageQuantity : 1 ItemTypeKeyword : science-lab-sieves Manufacturer : Dntum Material : Stainless Steel MetalType : other ModelName : Tool Sets ModelNumber : 71150411ID NumberOfBoxes : 1 NumberOfItems : 1 NumberOfLithiumMetalCells : 1 PartNumber : SYMXZJ0078015 ProductDescription : Tips: