Build for focus - Need a moment of zen? Build hundreds of super cool geometric shapes with Speks! From the cube to the buckyball, Speks Stripes - 512 2.5mm magnet balls Mash Speks for stress relief - Speks are like a magnetic putty, without the mess! Due to their 2.5mm size and low flux rating these mini magnets mash around and are oddly satisfying to touch. SpeksEd Is your go to resource for step-by-step instructions on building with magnet balls.