Base price shown. All further customization options will increase price by size/material respectively. Creating a custom cylinder, drum lampshade is much easier than you think. Click the Customize Now button to tell us the exact specifications of the lampshade you need. We will make a one-of-a-kind original creation just for you! Please be sure to double-check your measurements. These are nonrefundable products. Custom items may NOT be exchanged.Better help understanding our Drum Washer Attachment Lampshades:The interiors of the lampshades are constructed with white styrene (white lampshade plastic). All of these lampshades have washer (spider) attachments similar to the one depicted. This type of lampshade is generally used on lamps with a harp. A harp is NOT included with your lampshade. The inner diameter of the washer measures exactly 7/16 inches (Slightly less than 0.5 inches).For the Attachment Drop: This can be a little confusing. Many lampshades have a 1/2 inch drop. That means, the attachment is recessed 1/2 inch below the top of the lampshade. If you select a 2 inch attachment, the attachment will be recessed 2 inches below the top of the lampshade.Feel free to call or email us if you have any questions. Again, we don't want anyone guessing, for these lampshades are nonrefundable.