The Techno Gears Marble Mania Whirler is a construction set that is great to challenge your child's developmental and problem solving skills. Once built, they need to drop marbles onto the track for a fun run. This set includes a colorful instruction manual with step by step instructions and designs for ease of construction. Details: Multicolored Approximate finished size: 1.3 ft. Includes over 100 pieces ABS, plastic, cardboard and glass Requires 1-2 hours construction time Includes full color instruction manual For ages 6 and up