50-Pack Assorted Solid Rubber Stoppers, Acid and Alkali Resistant Material_Cork 125-inch inner diameter with a

125-inch inner diameter with a rod grip up to 5/8 inch for larger flasks on a retort stand

000 volts to demonstrate energy conversion

Locking control at any extension on this two-meter retractable tape measure

sized for repeated student use on solid-core and stranded wire ahead of crocodile-clip and terminal-block work

Dissectable three-part head joins eleven removable torso organs to expose cranial nerves

50-Pack Assorted Solid Rubber Stoppers, Acid and Alkali Resistant Material_Cork 125-inch inner diameter with aPack of 50 solid rubber stoppers in assorted sizes provides acid and alkali resistance for comprehensive laboratory vessel sealing applications.