Features: 1. 4 in 1 glass marble sphere graphite , good thermal stability. 2. High density graphite, and impact resistant, and sturdy. 3. Mainly used for glassblowing casting tool. 4. Good heat transfer performance of graphite, reduce melting time and save energy. 5. Easy to operate and convenient to use, long lifespan to ensure long service time. Specifications: Condition: Brand New Material: Graphite Size: Approx. 12*4.2*2.5cm/4.72*1.65*0.98in Weight: Approx.320g/11.29oz Diameter: A: 8 10 12 14 16mm B: 18 20 22 25mm Package List: 1 * Graphite 1 * Handle