For Stretcher bar, we have different thickness choice for our customers to choose, they are: 1, 2.5*1.8cm 2, 3.7*2.5cm 3,5*2.5cm 4, 5*2.7cm Custom size is also welcome. For oil paintings with frames, we would suggest you to go for thin stretcher bar, for oil paintings with stretcher only, we would suggest you to go for thick stretcher bar, because it will be stronger and also look better. Belowing chart shows the process that we produce the stretcher and also add it to our paintings, just for your reference. Features 100% Brand new! Non-toxic, odorless, safe and reliable stretcher frame. Made of high quality pine, high in strength, not easily deformed, it maintains its wood color and its original pine scent after manual treatment. Professional solid wooden frame kit for oil painting, posters, HD canvas prints, etc. Ideal home, office, gallery wall art accessories.