"Ward's® Thermochemistry In The Bag Inquiry Demonstration Activities"

A superior grade of rubber that has softness, resiliency, and durability

Solid, black stoppers contain a high percentage of pure rubber and weigh less than neoprene.

These stoppers are made of a superior grade of rubber that has softness, resiliency, and durability.

Versatile neoprene stoppers perfect for every laboratory.

These lightweight and durable polypropylene stoppers are acid proof and autoclavable.

Bag of 100 corks of various sizes.

Size Top Diameter Bottom Diameter

Size 1 11.1 mm 8.3 mm

Size 2 12.7 mm 9.5 mm

Size 3 14.2 mm 10.7 mm

Size 4 15.8 mm 11.9 mm

Size 6 19.0 mm 14.6 mm

Size 20 41.2 mm 34.0 mm

Convenient assortments of various sizes of rubber stoppers are sold as one-pound bags.