These are simply pieces of PVC pipe (electrical conduit).
Powerjelq - start with your penis at or near its maximum flaccid size. Place the sticks at mid-shaft and gently pull toward the head, making each pull last about three seconds. Pull out and down. Continue for 15 minutes, one or two sessions per day.
Do this in bright light, direct sunlight if possible, and watch closely for any bruises or other discoloration that develops. It WILL take some trial and error to learn how much force is too much. At first, avoid doing this with a full erection.
Lockups: grasp penis horizontally, positioning so that you can achieve maximum comfortable pull. Standing, pull upward, resting hands against abdomen. Pull and hold maximum upward intensity. Now gently lean back, then forward, then side to side. Do Kegels.
Advanced users ONLY!
Marksman technique - "sit on floor against the wall. Raise your legs so your penis hangs down between them. Reach round your legs and grip penis with sticks and streeetch. This is quite intense and gives an effect almost as good as hanging." Hold tension on for up to 15 minutes, then take a break and repeat if you want.
One handed gear shift - Wrap a rubber band several times around one end of the sticks. Sit against wall with legs apart on a carpeted floor. Grasp penis vertically with sticks, with rubber band on the bottom. Place rubber band end on floor, and use one hand to push outward. Hold tension on for up to 15 minutes, then take a break and repeat if you want.
Roll-ups - you can grasp your penis horizontally with the sticks, roll it forward (or back) and pull that way. Why would you want to do this? Boredom, I guess....
Directional variations - grasp and pull to the sides, straight up, out, down.
Basic version: PVC pipe (1/2" - 12.7 mm) -10" (25.4 cm) long
Deluxe: 1/2" with 1/2" dowel to allow roll