Unshielded coil forms are available in vertical or horizontal configurations in a variety of materials. All coils forms are designed to have fixed or variable coils wound on them either by the customer or by Cambion. Each coil form is offered with a range of tuning cores to suit a variety of operating frequencies. 

To view datasheets on Variable Inductor - Unshielded - Vertical and Horizontal

http://www.cambion.co.uk/Main/vari-unshielded.htm