Intra-Oral Class II Orthodontics Latex Elastic Clear Bands Class 100 elastic per bag (6.5 oz, Size 3/16)

ran out and these were the exact same ones that my dentist gives me. works well and doesn't need to be changed too often. Does break sometimes but you get a quite a lot and can reuse them (well I do anyway, don't know if you are meant to but the strength returns after it's dried).