Screw stopper: fine workmanship the practicality and durability. package includes multiple colors, easy for you to use.; Rubber plug: screw design can the good sealing effect. elastic texture, will not hurt the test tube.; Rubber bottle stoppers: the set contains 100 pieces of tube screw plugs, large quantity to meet your needs.; Test tube sealing plugs: the screw test tube plug is made of premium material, which has the .; 12mm plastic plug: the tube plug is made of premium plastic material, which can withstand the long-term use.
What's in the box
200 x Science Supplies
