Marklin, Inc
K Track

Flex Track 35-7/16" 900mm
Walthers Part # 441-2205
HO scale, $18.00, currently in stock at Walthers
This product is on-sale today for $16.20

 
Curves with different radii can be made with this track section. It can be cut using a coping saw. Length 5 x 1/1 = 900mm 35-1/2"