Zeekio Satellite Juggling balls are solid Millet filled. The balls are made of Teijin Cordley which is a new high-grade natural leather substitute that has superior texture and richness to natural leather. The new material provides excellent grip. Specs: 12 Panels Size: 67mm (2.63 inches) Weight: 125g (4.4 ounces) Material: WRP-7400 Teijin Cordley