ough Guys
Tough Guys are made from premium bamboo slats,  by stacking the slats we build in the bounce. 
Observe the end view; by insetting each row of the centre bamboo slats a very small amount allows the outers slats a lively bounce.   Plus these premium bamboo slats are tough.   They are slightly louder than standard bundles but the construction and material results in a very robust design.