1. Vertical strip spacing: conventionally 30, 40, 60 (mm); thiab qhov tsis sib xws: 25, 34, 35, 50, thiab lwm yam;
2. Kab rov tav bar qhov sib nrug: conventionally 50, 100 (mm); thiab qhov tsis sib xws: 38, 76, thiab lwm yam.;
3. Dav: 20-60 (mm);
4. Thickness: 3-50 (mm).
