Our Gmund Contact Colors translucent papers are 30lb bond which is heavier than many of the vellum sheets on the market. To make certain that this vellum works for your particular application we recommend ordering samples and testing before committing to purchasing a large quantity. It's easy to order samples on our website of all the papers you are interested in. Navigate to the products of interest and look for the "Samples" tab. Click add to cart and the samples will be added to your basket.