CHEMICAL RESISTANT - PTFE material can be used with corrosive chemicals, including acid and basePOWERFUL - PTFE casing helps reduce friction and wear while spinningEASY USE - Place inside a container of liquid that is seated on a magnetic stirrerPORTABLE FOR WIDE USE: perfect for stir a liquid or solution in scientific research, industry, agriculture, health and medicine, homebrew, etcModel Number: STIR BARColour:WhiteMaterial:PTFETypes: B SetPackage Contents:1 x 10mm x 4mm stirring rod,1 x 15mm x 6mm stirring rod,1 x 20mm x 7mm stirring rod,1 x 25mm x 7mm stirring rod,1 x 30mm x 7mm stirring rod,1 x 30mm x 8mm stirring rod,1 x 35mm x 8mm stirring rod,1 x Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.