?Packing Included? Body,Clamp,Hex wrench,Instructions(English and Chinese). ?Install Step by Step? Package included a hexagon wrench, you can use it to loosen the screw, and then install the product between the seat cushion and the seat tube.Just install in between them without changing the seat post or saddle.Please check the installation Instructions. ?High Quality Material? Made of special alloy spring steel material,which has the characteristic of fine toughness and duration, it is not easily deformed. Wide Application: It is suitable for a series of bikes, such as mountain bikes, road bikes, folding bikes and so on. ?Adjustable Design? Floating device printed on the scale can be adjusted to your preferences to adapt to different riding habits and make your riding more comfortable.You can adjust the position to adjust the height and elasticity.The higher the height, the greater the elasticity, the lower the height, the smaller the elasticity. ?How to Install? If hard to install for you,you can check the installation Instructions or look for help from others. ?Notice? Since Adjustable Clamp can be adjusted back and forth by sliding, when you determine the position, you must tighten Clamp with hexagon wrench, otherwise it will slide back and forth. ?Shock Absorption? It has a shock absorption effect that is obvious. Softens road vibrations or shocks and cossets your bottom, makes your bike ride smoother.Notice:If feel too springy,you can adjust the position down through the scale.If have no bounce to it,please adjust the position up through the scale.Becase It has a shock absorption effect different from position scale. ?Family Used? The shock absorber can be used all the people who can ride but the weight less than 440 and more then 45 pounds. ?Notice? This adds about 2-3inch to your seat height. So donot buy if the seat itself is too high.Bike Type: Mountain Bike. Brand: V-cyclin. Material: Alloy,Steel,Spring. Date First Available: April 8, 2021. Best Sellers Rank: #278,545 in Sports & Outdoors. Customer Reviews: 3.5 out of 5 stars 88 ratings 3.5 out of 5 stars. : B0921GZLT4. Style: ?Adjustable. Part Number: ?748461029160. Manufacturer: ?XGWW. Number of Items: ?1. Material: ?Alloy,Steel,Spring. Brand Name: ?V-cyclin. Item Dimensions LxWxH: ?6.3 x 1.97 x 3.35 inches. Package Weight: ?0.42 Kilograms. Item Package Dimensions L x W x H: ?6.81 x 4.02 x 2.64 inches.