Riser height 7 ¾ ’’, B10 starter kit with connectors and top extra riser hook straps plus four 2 step extensions with connectors # of steps / risers 18/18 & 18/19, Floor to Floor stair heights 137" to 143" (18 risers) & 145" to 151" (19 risers), Horizontal Run 187", All connecting fasteners with Allen key, parts list and assembly picture instructions included. Package Sizes & Weight 5"x14"x 72", 68 lbs. + four (5’’x 7’’x 25’’ 17 lbs) American customers pay in US $. (no sales tax). All payments including with credit card mare made through Shopify/PayPal.