All the carbon and plastic diabolo controls sticks by Mr Babache have the same end screw system. The idea is you save consumption of string as, unlike most other brands, the string does not go through the entire length of the stick. Instead you make a knot under the screw cap at the top of each stick. In our opinion this system is a pain in the arse as unlike other models like Henrys and Nitro you have to predifine the length of string you require, then cut the rest off. Henceforth you can only make ajustments to shorten the string which is a painfully slow process with this screw cap system. Finally the string delivered is only a very standard quality and just 1.7m long. All that said the handles are nice and the orange and yellow carbon models glow in the dark which is an inovation for diabolo controls.