Features: Two gears of different difficulty to increase the difficulty of training. The smooth tee design requires correct form and rhythm to keep the balls on the tray. Can train player to feel the perfect speed for long and short putts. And helps eliminate jitter. The tray is easy to install on any push rod shaft, and that general installation is to adjust the tightness by pushing up the shaft from the direction of the balls heads. This product does not include balls and clubs. Specifications: Material: ABS Color: For The Picture Shows Package Weight: approx.30g Size: approx.9.5x3.0x2.8cm/3.74x1.18x1.10in (More Size Detail, Please See Photo.) Package Includes: 1Pc x Golf Putter Balancer note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the differences between different monitors, the picture may not reflect the actual color of the item. Thanks!