full-stem curl half-stem curl no-stem curl rectangular base pin curls triangular base pin curls arc base pin curls square base pin curls Recommended along the front or facial hairline to prevent breaks or splits in the finished hairstyle. Placed half off the base of the curl. Usually recommended at the side front hairline for a smooth, upswept effect. Suitable for curly hairstyles without much volume or lift, and can be used on any part of the head. Placed directly on the base of the curl. Placed completely off the base of the curl. Give good direction and may be used at the hairline or in the nape.