Designed specially for the Rio Grande Cast-In-One™ casting machine, this clear plastic investing sleeve has a 3" diameter and fits into the 3"-dia. rubber base. Insert the sleeve fully into the base, ensuring a secure, leak-free placement. Make sure, as you build your tree, that there is at least 1/4" clearance between the wax patterns and the interior wall of the sleeve. To remove the sleeve after investing, slit the sleeve lengthwise and simply peel it away from the set investment.