Alvin - Grippy Mechanical Pencil - .5mm - The Alvin Grippy Mechanical Pencil is ideal for beginning or professional draftsmen or engineers. Premium construction features rubber finger grips for comfort and control, an oversized eraser in the cap, and a spring-loaded mechanism that advances lead 1/8 inch with each click of the cap. Alvin Grippy Mechanical Pencils are available in 0.5mm and 0.7mm. Color-coded bands denote line width. Good for general writing. Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Creative Coldsnow is a pround retailer of Alvin graphic arts, drafting and fine arts products.