Underground Toys Doctor Who Sonic Screwdriver and Sonic Pen Set - 10th Doctor David Tennant You can't call yourself 'The Doctor' without this Sonic Screwdriver. Includes an authentically modeled Sonic Pen that illuminates a blue light! Button-activated sounds and lights! Pen really writes with real black ink! Sonic Screwdriver illuminates a purple 'black' light. With this fantastic set, you get Doctor Who's Sonic Screwdriver and the Adiposian wet nurse's Sonic Pen! These authentically modeled goodies both have black ink nibs and a sonic emitter, and both feature button-activated sound and light effects. The plastic Sonic Screwdriver measures 8-inches long and pen measures approximately 6 1/2-inches long. The light casing for the Sonic Screwdriver is blue, but the light it gives off is a purple 'black' light. The Sonic Pen emits a blue light. You can't call yourself 'The Doctor' without this Sonic Screwdriver, so order yours right away!