What is this?Magnetic stir bars are used to stir liquids or solutions in the biology and chemistry field, research laboratory applications, etc. Usually used with a magnetic stirrer or heating stirrer, quieter, and more efficient than other stirrers.What will I get?The magnetic stir bar is in size of: Total length: 10mm / 0.39 inch; Diameter(Approx): 4mm / 0.16 inch;In the package of: 20 x Magnetic stir barAre there any advantages of the product?The magnetic stir bar is made from magnet with PTFE coating, the coating is corrosion resistant and has good resistance to high temperatures (temperature tolerance range:-180 ℃~250 ℃), smooth surface, reduces friction and improves smooth rotation, easy to clean.What should I notice?Please place the magnetic stir bar in the bottom center of the container when in use.

United Scientific RSTPK1 Sizes 1-6 Set of 39 Natural Rubber Stopper Assortment Please see pictures for details. Set includes:2 #6 double hole,2 #6 solid,5 #5.5 single hole,4 #5 solid,5 #4 single hole,5 #3 solid,5 #2 solid,6 #1 solid,5 #1 single hole. (bottom diameter/top diameter):#1, no hole, 14mm/19mm#1, one hole, 14mm/19mm#2, no hole, 16mm/20mm#3, no hole, 18.5mm/24mm#4, one hole, 20mm/26mm#5, no hole, 23mm/27.5mm#5½, one hole, 24mm/28mm#6, no hole, 26.5mm/32mm#6, two holes, 26.5mm/32mm

Vintage Becton Dickinson B-D Cornwall Continuous Pipetting Outfit and Filling Outfit. Includes Metal Pipetting Holder No. 1250MH, tubing, accessories, original instruction booklets, and boxes. Untested. Sold as found. Excellent vintage medical/laboratory display or collection piece. Condition notes to mention: * Box edge wear * Rubber tubing shows age discoloration * Untested * Includes paperwork shown