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Package Contains: 7 Sizes 25ml 50ml 100ml 150ml 200ml 250ml 300ml 1pcs Brush Heavy duty reusable, will not easily shatter Minimal thermal expansion, giving relatively high resistance to temperature changes High temperature resistance. Perfect resistance, good thermal stability High Resistance for Temperature Changes - The beakers are designed to be very resistant to all kinds of boiling temperatures and they have a perfect thermal stability. The graduation on the glasses is also specifically made to endure heavy temperature changes and heat