CRL SPS Curved Overhead Track is 6063-T6 Alloy Aluminum, and is designed to accommodate the heavier loads required in stacking system installations. Curved Overhead Track is offered only in the Standard Style. Length and radius* must be specified at time of ordering. Minimum radius is 12' (3.66 m). Contact our Technical Sales Department for additional information. Important Notes: STRUCTURAL DISCLAIMER - All customers who in any way utilize this product are solely responsible to consult a structural engineer to determine the suitability of the product for the intended use and site conditions. All installers must be qualified and have professional knowledge about compliance with local, state and federal regulations, safety factors, and the appropriate choice of fixing material and procedures. The minimum radius this material can be bent to is 144" (3.66 m).