Feature: 1. Excellent Quartz Material: This crucible dish cup set is made of excellent quartz material, which is sturdy and abrasion resistant, not easy to be damaged, with excellent durability and thermal conductivity, able to withstand high temperatures up to 2,800°F / 1,537°C, ensuring you work security and effectively in a variety of high temperature environments. 2. Multifunctional: This quartz crucible dish cup is multifunctional and suitable for refining and casting a variety of metals, such as platinum, gold, silver, brass, copper and alloys. Whether for metal smelting or jewelry making, this quartz crucible can handle it easily. 3. 5 Different Sizes: This quartz crucible bowl dish cup set has 5 different sizes, including 100g, 150g, 250g, 500g and 750g, which can meet different experiments and casting needs, very practical. 4. Wide Application: This crucibles melting dish is widely used in many fields such as electric light source, semiconductor, optical communication, military, metallurgy, building materials, chemical industry, machinery, electric power, environmental protection and so on, it is a powerful assistant for laboratory and industrial production. 5. Compact And Lightweight: This jewelry refining casting pot set is small in size and light in weight, which is very convenient for melting casting refining gold, silver and brass alloys and so on. Specification: Item Type: Quartz Crucibles Material: Quartz Set Includes: Quartz Bowls x 5 (Approx. 100g / 3.53oz, 150g / 5.29oz, 250g / 8.82oz, 500g / 17.64oz, 750g / 26.46oz) 250g Size: Approx. 7.5 x 2.5cm / 3 x 1in(W x H) 500g Size: Approx.9 x 3.5cm / 3.5 x 1.4in(W x H) 750g Size: Approx. 9.3 x 3.6cm / 3.7 x 1.4in(W x H) 100g Size: Approx. 5.5 x 2.2cm / 2.2 x 0.9in(W x H) 150g Size: Approx. 6.2 x 1.8cm / 2.4 x 0.7in (W x H). Package List: 5 x Quartz Crucibles