Avondale treads are 8.75” x 28”

15 treads including top, but not including corner landing

$38 for 13 at amazon 13 Stair Treads - Indoor and Outdoor Use - #103. 23x8"

$54.59 at amazon Ottomanson Softy Solid Skid Resistant Rubber Backing Non Slip Carpet 9" x26" Stair Tread Mats 14 Pack, Brown

Non Slip for treads

ruglock.com/

RugLock youtube RugLock Tutorial | How To Keep Your Rugs From Slipping

$41 at amazon RugLock: Non-Slip Rug Pad Spray (16 oz can)

Ruglock a non-slip rug grip

Gorilla Grip 8x10-Feet Non-Slip Area Rug Pad for Hard Floors