Single-use female probe. To be used with lubricant to protect the urinary tract. Closed end, with two lateral eyes, colour-coded funnel, length: 18 cm, Made of PVC, Sterile packaging. This catheter is available in various charities. What is a career? Charrier (CH) is an international size that indicates the diameter of the catheter. One Charrier is 1/3 mm. Female catheters are usually prescribed in 12 or 14 CH. Male catheters are usually prescribed in 14 or 16 CH. The doctor or specialist nurse will determine which thickness catheter is most suitable for you.