This aluminum coater has a reservoir to hold the emulsion while applying it to the screen. Custom sizes are billed at $3 per inch and take 5-10 business days to build. Please enter the size you want as the quantity. If you need more than one coater, enter the total amount of inches and write in the description. Please note all coaters will include end caps that add an extra 0.25" to your specified scoop coater size.