Extra band set. For the book charkha, one size fits all.
For the larger charkhas, which are not all the same, measure the inside circumference of the band you want to replace, or take a piece of sewing thread and wind it once around the large drive wheel and the small pulley under the accelerator wheel. Then mark where the thread crosses itself, remove the thread and measure that length between the marks. The accelerator wheel can slide, so you may want to move it to both extremes of its position to get a range for the band size.
The stock briefcase charkha band is 19"
The stock attache size is 24"
If your band is a different size, please contact us. We may be able to get what you need.