These sets consist of moulded balls of different colours 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 185 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 37 connecting lugs & 75 balls of different colours & sizes packed in a moulded box.