PRACTICAL MATH TEACHING AID -- One of the most flexible tools for creating random events to teach probability during games and visually demonstrate math concepts in the classroom. VERSATILITY -- These clear spinners are great for replacing lost or broken board game spinners or incorporating into a math lesson plan. Draw on them to create probability zones or use as an overlay on top of paper. BUILT TO LAST -- The spinners are constructed of clear, flexible and durable plastic. Easily washable and small enough to store away, these spinners are a math must-have. SET OF 5 -- Each packet comes with 5 spinners - perfect for small group activities in a classroom environment or individual use. PRO TIP -- You can use a Vis-a-Vis Pen (wet erase) on these spinners to help keep your writing from coming off. Just use a wet paper towel or wet tissue to wipe off the Vis-a-Vis writing after use. PACKAGED FOR PROTECTION -- Please remove protective blue film from each spinner before use. Film is used to reduce scratches when shipping.