Mount your exhaust chamber correcting with the PowerFactor Products mounting block kit. The blocks are made of 100% HydroTurf. They can be shaped easily to conform to your mounting needs. These blocks can also be used in all aspects of a jet ski build, wherever needed. These blocks come with each exhaust kit but can also be purchased separately. (Two blocks per kit - one small at 13cm x 12cm x 5cm and one large at 13cm x 12cm x 10cm.)