ConvaTec GentleCath - 16" Coude Tip Intermittent Catheter is an uncoated PVC catheter with a curved tip for easy insertion. These intermittent catheters come in a variety of sizes and offer extremely smooth polished eyelets to minimize friction. The coude tip adds extra comfort and ease when inserting and removing the catheter. French Size: 12, 14, 16, 18. Each, Box of 100.