8/1/23 UPDATE! I've had to reduce the length from 24" to 21", as USPS was killing me on shipping.
 
This is the ideal tube for fabricating R/C Crawler cages, bumpers, chassis and accessories! No toxic coating, unlike brakeline, and it welds and brazes beautifully. These are sold in 21" sticks, and ship in a strong cardboard tube. 
 
Ordering (1) unit will get you (1) 21" stick. If you choose "pickup in person" option, I will be able to refund a bit of your payment, as shipping is factored into the total price.
 
NOTE: These come from the manufacturer 'pretty straight.' Some of them may have a slight curve to them, but they can be straightened by you using various methods. Most of them are straight.