This set encourages color and shape recognition. The bolts only fit with the nut having the same shape. Includes 4 types of illustrated plastic activities cards which hold up great for classroom use. 36 of each nuts and bolts packed in a storage case.Details:Includes assorted colors2.5"36 nuts and 36 boltsIncludes a 16 illustrated plastic activity cards (4 of each illustration)Combine Real and Digital play with Play MinilandThis set encourages color and shape recognitionFor ages 2-5