Great accessory for your xlab sonic wing an excellent way to hold your xlab co2 cartridges and xlab nanoflator or speed chuck attaches to the rear of the xlab sonic wing system makes inflating tyres a snap during training rides or out on the race course holds up to two xlab co2 cartridges key features designed for xlab sonic wing system weight 16g manufacturer claimed colour silver mounting hardware and assembly instructions included made in the usa