"The Sticky JUMBO is the largest size available in our Sticky series. It's Eco-Friendly design consists of two layers of materials: a firmer, inner core made from recycled Iomic grips, and a softer surface layer of new Iomax material. Weight: 65 ± 3gTorque: 1.9Core Size: M60Firmness: FirmAvailable in Round only."