คำอธิบาย
| Specification | Inner Diameter | Outer Diameter |
| 14B | 1.54mm | 1.83mm |
| 15B | 1.36mm | 1.65mm |
| 18B | 0.84mm | 1.27mm |
| 20B | 0.61mm | 0.91mm |
| 21B | 0.51mm | 0.82mm |
| 22B | 0.41mm | 0.72mm |
| 23B | 0.33mm | 0.65mm |
| 25B | 0.25mm | 0.52mm |
| 27B | 0.20mm | 0.42mm |
| 30B | 0.15mm | 0.31mm |
Esd Spu Slippers W00320