Metal Holder Equipped with a sturdy metal holder, this enlargement training device provides reliable support and stability during use. Non-Electric Operation This manual enlargement training device operates without electricity, making it a convenient choice for users seeking a non-electronic solution. Adjustable Vacuum Cup The Size Master device features an adjustable vacuum cup, allowing users to customize their training experience for optimal results. Three Size Options With three size options, the device caters to different stages of training, ensuring a comfortable and effective enlargement process.