1. Steel compass tip, not easy to deform, durable 2. Zinc alloy is strong and durable 3. The rotary switch can control the holding length of the pen 4. Polypropylene plastic has good insulation performance and impact resistance 5. Radius: Small 45cm, Large 75cm 6. Size: Small 25x90cm, Large 40x150cm 7. Weight: Small 204 grams; Large 254 grams
