DIN 12871. Solid.

Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers
Test tubes stoppers
Stoppers rubber
Rubber stoppers