Sliced Bamboo Mat woven with natural Jute string. Certified by the Badatz Eidah Hachreidis of Yerushalayim .  
Various sizes available.
The Mehadrin mats are made with bamboo slats woven with a natural reed. Certified Mehadrin with Badatz hechsher.
Available in a wide range of sizes!
No cloth string, yarn or anything spun is used, so it follows kosher standards.