Please select either the L-shaped type or the bar-shaped type. This is a finger rest designed to accommodate the step on the pickguard. It can be securely fixed with the included double-sided tape. The L-shaped type is essentially a virtual 5th string for the apoyando technique. I don't know who started it, but personally, I don't think it's very effective. It doesn't flex like a string, so the feel is fundamentally different. However, I think it functions well enough as a rest for your fingers, and depending on the playing style, it might have some use after plucking the 4th string. The bar-shaped type is a bit softer on the fingers. It might be good for those who find it painful to rest their fingers on the corner of the pickup. However, it's not designed to contribute to the stability when resting your finger on the 4th string. In this case, I recommend the half-finger ramp with a rectangular rest, or type A, which is just the rest part, which I also have for sale.