Made of medical grade stainless steel, non-toxic material, safe to skin and durable to use Measures the Golden Mean, also known as The Golden Ratio and Phi is a ratio of 1:1.618 Accurately position in eyebrow shaping, adjustable size allows it to measure various kinds of eyebrows and paint the most suitable eyebrow shape Detachable nut bolts to use for ease of both left hand and right hand use, durable for daily eyebrow make-up use Premium Quality Golden Mean Calipers. Ideal for Biology & Art Students, Makeup Artists, Artists, Designers, Dentists and Architects 1. High quality, easy to use, new uniquely designed Golden Mean Gauge calipers 2. This stainless steel instrument is crafted with a great sense of design, compactness and usability 3. We offer 60 days money back warranty and lifetime replacement. If you are not 100% satisfied, feel free to contact us Specification: Material: stainless steel Function: Locate eyebrow shape, measuring tool Package Weight: 80g Package Include: 1 x Eyebrow Caliper 1. High quality, easy to use, new uniquely designed Golden Mean Gauge calipers 2. This stainless steel instrument is crafted with a great sense of design, compactness and usability 3. We offer 60 days money back warranty and lifetime replacement. If you are not 100% satisfied, feel free to contact us Specification: Material: stainless steel Function: Locate eyebrow shape, measuring tool Package Weight: 80g Package Include: 1 x Eyebrow Caliper