Can filter chemicals that cannot be filtered by filter paper or diaphragm; can be used with filter flask, filter adapter cones and others; ideal for chemical analysis, petroleum industry, pharmaceutical industry and so on. G3 15-40 m Nominal Max. pore size; compatible with Qualitative/Quantitive Filter Paper Circles in 94 mm diameter. 24/40 Joint; glass Filter Funnels; made of borosilicate glass. Heavy duty design, premium quality, low expansion coefficient, heat and resuable. Borosilicate glass; heavy duty design; reusable and high quality. Colour:Transparent Material:Glass Package Contents: 1 * Filter Funnel Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.