The javelin is made of a duraluminium shaft with a steel head. Cow Ghee 600 gm - Online Grocery Shop Club Team Training Equipment Polanik Training Javelin - Class T - 400 Gm - Javelin Affordable Practice Javelin This model is the 600-gram weight, which is a common training weight for developing proper throwing technique and strength. The shaft is made from aluminum... This makes the POLANIK SK javelin the right choice for clubs seeking for a model while needing several pieces at a time. POLANIK Class SK Training Javelin. The Polanik SK is a cheap school javelin. Cheap school javelin. School javelin at afordable prices. Available weights: 300 gm, 400 gm, 500 gm, 600 gm, 700 gm, 800 gm It is a very good combination of low prices and high durability.