Make your own spinner dice or invent your own games! Suction spinners work great on whiteboards to design with write-on/wipe-off markers. Customize your own classroom activities! Set of versatile suction spinners will stick to most smooth surfaces and work well on horizontal and vertical bases. Spinner arrows measure 3.94" each. Each pack includes 10 spinners. Sold as 3 packs for a total of 30 spinners.