HQ-201 XO/ HQ201 XO HEP*: Biocompatible and soft one-piece. HQ-203 XO/ HQ-203 XO HEP*: Stable and durable monofilament haptics. HQ-204 XO/ HQ-204 XO HEP*: 4-point stability in a one-piece. *Surface modified with heparin.