Rubber stopper with hole: these rubber stoppers are using a suitable taper shape design, easy to insert and pull,flask rubber stopper
Rubber plugs for laboratory: the rubber plugs can be used with the test tube, a necessary sealing rubber stopper for experiments,rubber stopper plug
Not damaging to bottles or test tubes: taper design for easy insertion and removal, the test tube stoppers can offer you convenience,sealing plugs
Laboratory test tube bungs: these rubber stoppers with hole are suitable for test tubes, flasks and other laboratory equipment that need to be sealed,conical flask stopper
Flask cones adapter: fine workmanship with rubber material, and good durability, the sealing plugs can be used for a long term,test tube plugs