Hismith is a design, development, and production of an integrated company. we focus on high-end sex-machine design and production. Our goal is to help our customers pursue ultimate pleasure in their private life. Our business philosophy is symbiosis and win-win with other brands. This item is made from high-quality stainless steel material, with super bounce-back power. A new idea to enjoy automatic sex. With this spring adapter, you can enjoy without adjusting the machine. you don 't need to maintain a posture for a long time, you can find a comfortable position when using the machine. if you want to feel free, why not try it! PARAMETERS: Total Length: 12cm (4.72 inches) Extend length:10.5cm (4.13 inches) Spring Length: 5.6cm (2.2 inches) Material: Alloy spring steel & Stainless steel Net/Gross Weight: 186g (0.41LBS) PACKAGE INCLUDING: 1 x Hismith 4.13 '' Spring Extender SOMETHING IMPORTANT YOU NEED TO KNOW: Please do not use a huge dildo or male masturbation cup with this adapter Please do not wash this adapter with strong detergents in case of rusting Please do not keep your eyes too close to the attachment when changing it. What is KlicLok System? ---KlicLok system is an Eight-square connector, designed for non-spin thrusting. More steady than other connector systems, keep attachments in position, say no to the rotation. ---KlicLok System is a quick connect and release coupling solution, that help user replace the attachments in a short time, truly unusual convenience and quickly DECLARATION: All product data are collected by manual measurement, for reference only! Besides, This product is only compatible with Hismith Premium Sex Machine with KlicLok System Love Machine.