The concentration will be listed on the lot specific Certificate of Analysis. Please navigate to the ‘DOCUMENTATION’ section of the Product Detail Page to access a Certificate:
https://www.sigmaaldrich.com/product/sigma/d3035#product-documentation
The volume will depend on the pack size ordered and the concentration.
For instance, a 0.5 mg pack at 0.05 mg/ml will have a volume of at least 10ml.