Rosen supply non-standard ceramic sleeve that made of zirconium oxide.
2.5×12mm Ceramic Split Sleeve 
3.5×6.4mm Ceramic Split Sleeve 
Special Size Ceramic Sleeve
2.5×12mm Ceramic Split Sleeve Specification:
| Outer Diameter: Φ2.5±0.02mm | Insertion Loss: ≤0.2dB |
| Inner Diameter: Φ1.25±0.001mm | Pull Force: 2-6N |
| Length: 12±0.1mm | Working Temperature: -40℃-+85℃ |
3.5×6.4mm Ceramic Split Sleeve Specification:
| Outer Diameter: Φ3.5±0.02mm | Insertion Loss: ≤0.2dB |
| Inner Diameter: Φ2.49±0.001mm | Pull Force: 2-6N |
| Length: 6.4±0.1mm | Working Temperature: -40℃-+85℃ |
Ceramic Sleeve with Shoulder:
OD:130mm
ID:0.5mm
Length:1-130mm
Custom-Made
Honeycomb Ceramic Sleeve:
OD: 100mm
ID: 0.8mm
L: 1-130mm
Custom Made