Carbon Fibre Propeller from Bolly-Aviation. Top-Quality and 100% Australian-made. Light, strong and durable design and finish. Suitable for all MTO, MTO Sports and Cavalon models in Australia. Bolly Props are perhaps the best range sports aviation propellers available. Using the latest in design and construction techniques. All Optima series blades now feature our DuraTuff leading edge. Incredibly smooth, quiet, powerful, efficient and incredibly tough. You deserve the best in propellers. and here they are.