Vial preparation allows for a variance of the purchased research-grade product by weight. Please contact our Technical Support scientists for additional information. Our exact weight service is available for research-grade products supplied at 1 mg or greater. The exact weight will be printed on the vial label up to two decimal places (e.g., 1.02 mg). There is a $55 per vial fee for exact weight. Please contact sales@caymanchem.com for a quote.