These are 16mm diameter Soft Shock Bladders compatible with the majority of car brands such as Mugen, Kyosho, Xray, Serpent, HB, Losi, Mayako among others.
They have the same design as the red membrane (UR1702). The material with which they are made and their interior design make the bladders keep their original shape and do not flatten. Thanks to this, the rebound of the shock absorber is constant and the performance of the car is much more regular even on the bumpiest tracks.
The bladders affect a lot the rebound and the pack of the shock absorber, so affects a lot on the overall performance of the car, especially on bumpy conditions and jumps landing.
Difference between the hard membrane UR1702 and the soft membrane UR1702-S:
A softer bladder provides less pack and rebound while facilitating the car’s roll when cornering.
A harder bladder provides more pack and rebound while increasing the roll of the car during cornering.
Soft bladders are recommended for bumpy or low grip tracks and hard bladders for smooth or high grip tracks.