Riser height 8¼ ’’, C10 starter kit with connectors and top extra riser hook straps plus three 2 step extensions with connectors # of steps / risers 16/16 & 16/17, Floor to Floor stair heights 129" to 135" (16 risers) & 138" to 142" (17 risers), Horizontal Run 124", All connecting fasteners with Allen key, parts list and assembly picture instructions included. Package Sizes & Weight 5"x14"x 64", 63 lbs. + three (5’’x7’’x 23’’, 15 lbs) American customers pay in US $. (no sales tax). All payments including with credit card mare made through Shopify/PayPal.