... latex material.Features:1) Model 97-4301: a) Glass dropper 3" straight, 12/pk b) Quality black ... Quality black rubber bulb4) Model 97-4402 : a) Glass dropper 4" curved, 12/pk b) Quality black ... boxWe have many other lab glassware, including stain dish, glass stirring rods, desiccator,Petri dish, media storage, funnel, ... , measuring cylinder, pipette, test tube,distilling apparatus, graham condenser etc.