These sets consist of moulded balls of different colors and sizes along with connecting lugs of different sizes. These sets are very helpful in modelling different organic & Inorganic compounds. SENIOR SET: This set consists of 150 lugs & 370 balls of prescribed colours & sizes packed in a moulded box having separate space for every particular colour & size of ball. JUNIOR SET: This set consists of 30 connecting lugs & 75 balls of different Colours & sizes packed in moulded box Material: Polypropylene