Description The Yster ISUP Paddle Stringer Technology TM kit Add extra stiffness to your inflatable Yster board The Yster ISUP Paddle Stringer Technology TM kit allows you to easily connect an additional Yster SUP paddle as a stringer to stiffen your board and reduce flex. The Yster ISUP Paddle Stringer Technology TM kit works with all Yster Full Carbon paddles and is available for the following boards: Yster ISUP 14’x 28″ Linear from 2024 Technical specification: Special screws in stainless steel.