Pica BIG-Dry Summer Heat Refill Leads, 12PK a convenient set of 12 refill leads stored in a durable plastic box designed for easy access. This set includes four graphite, four red, and four yellow leads, each with a rectangular 2 x 5mm profile and a length of 150mm. These leads are for marking on most surfaces, excluding glassy or glossy ones, and they remain stable even in high temperatures up to 158 degrees Fahrenheit (70 degrees Celsius). The practical storage box features a two-piece wing lid that ensures quick and simple lead , making it an i choice for professionals working in challenging summer heat conditions. Model Number: 6070