So-called "Blu-tack". Pliable substance with many applications. Ideal for fastening charts or calendars to walls without damaging the surfaces. Also useful for cleaning typewriter keys.
所谓的“Blu-tack”。具有多种用途的柔韧物质。非常适合将图表或日历固定在墙上,而不会损坏表面。对清洁打字机按键也很有用。