Tressa Waves - Clientage Econo 12 Pack has the softness of an acid wave with more longevity. Expect a longer lasting soft curl pattern with volume. For hair types that are normal or healthy tinted. Not recommended for hair types that are fragile tinted, high lift tinted, bleached or double processed. Techniques that work well with this perm include: Conventional Roller Crop Top, Spiral and Specialty Wraps.