Cork Stopper, 10-Pack Biology_Cell Biology Entry-level two-part human skull model

Entry-level two-part human skull model separates the skull cap to reveal the cranial cavity for introductory head-anatomy teaching at secondary and college levels

sized for materials-science comparison of composition and properties

and chemical reaction contrasts

Hexagonal hollow stopper in borosilicate glass features 29/32 cone with round end for sealing ground joint vessels and chemistry apparatus

and a semi-circular glass block fill this tabletop optics kit

Cork Stopper, 10-Pack Biology_Cell Biology Entry-level two-part human skull modelNatural cork bark stoppers with a tapered profile seat into a range of bottle necks and flasks for general purpose non reactive closure.