3/8" (link wire diameter)galvaized chain with 1/2" (clearance) inner eye. 1ft = ~9 links. 1ft= ~0.65kgUse from the block up ~6ft with jug to float off the bottom. And from the Buoy down ~4ft as balast. Cut to length ordered by the foot.This stuff is heavy, so try and get a local source first, because it is going to cost a small fortune to ship.Use with a 7/16" Shackle (that has a standard 1/2" pin) - IT WILL FIT. A 1/2" shackle (with standard 5/8" pin)willNOT fit.Discount coupons not premitted forbuoy items. Prices will be corrected on order submission as appropriate in relation to theprice structure.