The big brother of the Junior Jack Hammer built to withstand the most punishing treatment fun loving kids can dish out. While encouraging outdoor play this product also improves co-ordination, balance, and fitness! Comfy mountain bike hand grips. Internal hardened spring for long life. Maximum bounce is obtained for children up to 70kg in weight. Supplied in a glossy full colour box with a view window to see colour. NB: 3 colours available Red, Blue & Purple. Colours randomly supplied when ordered.Suitable from 8 yrs+Box Size: 105.5 x 31 x 6.8 cm