Creative learning products which develop muscular coordination, manual dexterity, and construction concepts. All parts of both Junior and Senior sets are made of hardwood, and construction lengths are drilled at regular intervals for bolting. Nuts and bolts are color-coded for easy recognition. Junior Set (model 1-03690-00) contains 12 red, square-headed bolts, 5/8 inch in diameter and 4 inches long; 12 yellow, square nuts; 4 right- angle joints, 2 by 2 inches by 7/8 inch; and 10 lengths of various size. Senior Set (model 1-03140-00) contains 50 red, square-head bolts, 5/8 inch diameter and 4 inches long; 50 yellow, square nuts; 6 right-angle joints, 2 by 2 by 2 7/8 inches; 4 right-angle joints, 2 by 2 by 9 inches and 41 lengths of various size.