b'NEW 2190, 2191, 2192, 2193, 2195, 2196, 2197, 2198 Zircon BlocksEach ceramic ball is muchThe core of the new Zircon blocks are industrial ceramic ball bearings more expensive than any other material weve used. So, tomounted inside caged races. The cages keep these bearings apart keep the block from gettingso they dont bunch up, touch, and stop each other. The result is crazy pricy, Zircon blocks employ seven balls, a fractiona VERY free-running block with less energy lost to friction than in of what our other blocks use.even our current Carbo blocks. Give an unrigged Zircon block a strong spin, and it spins an incredibly long time.Why ceramic bearing balls? Ceramic is a more familiar name for the metallic oxide Zirconia. Zircon bearings are more than 700% EASE WHEN YOU NEED IT. stronger in compression than stainless bearings of the same size. So, they wont deform if used within the recommended load limits. More importantly, they dont absorb as much energy before starting to roll. This becomes evident when you need to ease a sail in very light air. These blocks respond! You feel even the slightest fluctuations in sheet load. When used expertly, that means better sail shape and more speed. For the same bearing sizes, ceramic withstands incredible compression loads, but beyond the limit, they tend to crush not flatten. So, apply them thoughtfully in your rig. Well be the first to admit Zircon blocks are not for everyone. Theyre more efficient than other Harken small boat blocks, but more expensive too. Heres how we see it: 1. This is competitive. If we dont offer this level of performance, someone else might. 2. Sailors know best. If they try one and find value, they will buy more. The opposite is also true. Were good with that.2190 2191 2192 21932195 2196 2197 2198Sheave Max linePartLength Weight No. Description in mm in mm oz g in mm2190 40 mm Single19/16 40 23/860 0.81 22.9 5/16 8 2191 40 mm Single w/becket 19/16 40 27/873 0.93 26.5 5/16 8219240 mm Double 19/16 40 23/860 1.58 44.7 5/16 8219340 mm Double w/becket19/16 40 27/873 1.68 47.6 5/16 8 219557 mm Single 21/457 3 1/8 79 1.58 44.8 3/810 2196 57 mm Single w/becket 21/457 3 3/4 95 1.81 51.4 3/810 2197 57 mm Double21/457 3 1/8 79 3.05 86.4 3/810 219857 mm Double w/becket 21/457 3 3/4 95 3.27 92.7 3/810 Performance figures unavailable at press time. Please consult the Harken website before purchasing.5'