[Upgraded Design]-- The two-part sponge makes the volleyball wobble more when hit, making you feel more like you're playing against someone. Also, two carabiners even easier to use. [Ease to Use]-- This upgraded volleyball spike trainer comes with TWO carabiners. One is for easily connect it to basketball rings, poles, broom handles, backyard playsets, garage ceilings, and many more. The other one is for quickly separating the bottom and also better prevent the bottom falling off when you make a strong spike. [A Must Have for Spiking Techniques]-- and , the spike trainer holds the ball securely in place while the attacker develops form and hitting techniques, perfect for use at camps, clinics and practices at all levels. [Realistic Ball Movement]-- Improve your hitting technique without ever a ball with this volleyball training aid. Work on arm swing, ball contact and footwork without the need of another person. Colour:Black Material:Elastic + Webbing Package Contents: 2x volleyball spike trainer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.