Create extra-tight, micro-defined curls with lasting hold using the Annie Cold Wave Rods — salon-grade long perm rods with a curved design and flow-thru vents that deliver even saturation and consistent curl results for all hair types at home or in the salon. Rubber band holds hair securely in place around the rod throughout the entire setting process. Large curved perm rod shape creates extra-tight, micro-defined curls with natural-looking body. Small ridges and textured surface grip hair firmly to prevent slipping during use. Flow-thru vents allow for better solution or moisture saturation from root to tip. Narrows in the center to create a tighter, more defined curl at the root for long-lasting results. Diameter: 1/4 Inch