"thin strip of wood" - Translation from English to Arabic

There they were allegedly subjected to treatment such as being hit on the back and beaten with wooden sticks, a thin strip of wood and a leather club packed with sand.
وهناك قيل إنهم تعرضوا لمعاملة مثل الضرب على ظهورهم، وضربهم بعصي خشبية، وشريحة رفيعة من الشخب، وهراوة جلدية محشوة بالرمل.