S=30 Pencils, M=60 Pencils: These color-changing pencils appear dark in high-temperature environments and shift to a lighter shade in low-temperature environments. You will receive a set of 30 thermochromic pencils, featuring five unique metallic hues: pink, yellow, blue, purple, and green. Each ""mood-changing"" pencil is topped with an eraser that perfectly complements the color of the barrel. These wooden pencils are vibrant and eye-catching their metallic-finish barrels undergo a fascinating color transformation when exposed to a sufficient temperature shift. Under the light, the glitter embedded within the barrels refracts a dazzling, brilliant sparkle. Crafted from wood, these color-changing pencils measure approximately 7.48 inches (19 cm) in length-a comfortable and well-balanced size that makes them ideal for adult use. Furthermore, they serve as highly appealing prizes for various school competitions. Weight: 0.44 lbs.