"Plasticoid"

Solid, 1-hole and 2-hole stoppers in assorted sizes.

Made of molded, black rubber with a conical opening 27 mm at the top tapered to 22 mm at the bottom, the crucible holder includes a glass funnel.

Solid, One-Hole, Two-Hole, and Three-Hole Rubber Stoppers in One Unit.

Black sponge rubber guards prevent breakage and rolling.

An outstanding advance in rubber stoppers, four stoppers in one reduce inventory confusion and cost.