These slides are made from premium hand pulled borosilicate tubing. Each slide is approximately 4mm thick and (72mm) long. Sharp Violet is a transparent purple color small air inclusions throughout the material, this color shifts from dark purple in daylight, to silver under fluorescent light. similar to its color, this slide has a unique but familiar tone that is dependably warm and awesome. . These slides are also available in our (33mm) Lead Collection.