Pica Dry Summer Heat Refill Leads, 8PK a convenient set of eight refill leads housed in a durable plastic storage box designed for easy access. This set includes three graphite leads, three red leads, and two white leads, making it versatile for marking on most surfaces except glassy and glossy ones. The leads are specially formulated to remain stable even in high temperatures, up to 158 degrees Fahrenheit (70 degrees Celsius), ensuring reliable performance during hot summer conditions. The storage box features a two-piece wing lid that opens smoothly, allowing quick of leads whe needed. Model Number: 4070