Optimale Endurance Trainer Stroker Frost Clear. You can go the distance! Stamina training methods like edging have become standard as men everywhere learn to apply this technique for increased stamina and more powerful orgasms. Get in on the action with the Optimale Endurance Trainer, a hard case stroker with a built in squeeze plate grip that allows the user to control the pressure. The Optimale Endurance Trainer is lined with a tight, textured insert in lifelike Ultraskyn, a material designed to warm to body temperature with use and emulate the feel of real skin. This stroker's end cap adjusts to perfectly customize the strength of the suction desired, and a screw on top makes it easy to store safely and discreetly. Order now and start experiencing the sexual health benefits of endurance training today! Features: builds stamina and improves sexual well being. Airtight end cap twists to control suction strength. Textured Ultraskyn Masturbator with strong outer case. Life like Ultraskyn warms to the touch. Squeeze plate allows user to control pressure. Screw on top for discreet storage. Fully disassembles for cleaning. UPC Code 782421061913. Total length 7.5 inches, insertable, usable length 7.5 inches, width, diameter 3 inches. Circumference 9.5 inches. Bulk weight 1.35 pounds. Package weight 1.45 pounds. Materials ABS plastic case, Thermoplastic Elastomers TPE Ultraskyn. Video. 18.