I used to get BDs 30 that were 1/2 - very nice for subq but 29s are better for pec IM injects anyway, bis, tris, delts sometimes too. Thought my box of Terumos were 30 but no, they are 29. Really 29s are better since they can do water as well as oil if the oil is a high quality product (or you mix your own like I do)