Best quality red rubber. Shore hardness in range 46-55. Bottom diameter moulded on top face. Resistant to dilute acids, alkalis and ammonia.
Includes packs of 10 stoppers of each of the following sizes:
Solid: 13 x 16mm
Solid: 19 x 22.5mm
Solid: 31 x 36mm
One Hole: 19 x 22mm
Two Hole: 31 x 36mm
Pack of 50.
Please note: Extreme care must be used when inserting glass into the holes in rubber stoppers.
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