Petranoff Javelin 300 grams. Durable, stiff, and affordable, the Petranoff Javelin is made with high quality aluminum. Each implement is designed, tested, and produced with the utmost attention to quality control and advanced production. Presenting the all new Petranoff javelins. This product is the result of more than 40 years of sweat equity and innovation. Durable, stiff, and affordable, the javelins come in 300, 400, 500, 600, and 800 grams weights and are made with high quality aluminum. Each implement is designed, tested, and produced with the utmost attention to quality control and advanced production.