TE37SL: Based on the TE37 base version of the improvement, SL is the abbreviation of Super Lights, meaning "super light". TE37: the oldest bronze TE37 is made of 6061 aluminum single product forging, forging process, Rays using high-pressure forging and a second slow forging process multi-pressure treatment of the wheel. During the forging process, Rays uses high pressure forging and a second slow forging process with multiple pressures to treat the rim of the wheel, a hydraulic press to form the wheel blank prototype, and then a rotary press to shape the wheel. Compared to other aluminum wheels of the same size, the TE37 has nearly 20% higher tensile strength and elasticity against permanent deformation, making the TE37 a balance of light weight, durability and rigidity.