Oxygen-free copper (OFC) lead wires for cartridges. Please note that postal deliveries currently do not operate on weekends and holidays, and delivery times have been extended by 1-2 days or more, so it often takes longer. If you are in a hurry, please choose a different shipping method. Important Notes: ★ Due to shipping constraints, the lead wires will be shipped only in a zip-lock bag. If you require damage insurance, please notify us before purchase as it will require an additional shipping fee. ★ The terminals of lead wires often use phosphor bronze or other copper alloys because they are too soft if made of ordinary soft copper, which can cause poor contact during use. Therefore, avoid forcing them in too hard, as this can easily break them off at the base. (Compared to copper, these alloys are harder and less ductile, making them more prone to breaking under impact.) Use needle-nose pliers to gently insert the terminals, gripping the flat part of the tip or the flat part near the insertion point. The hole diameters at both ends of standard lead wires are different even when unused. Cartridges and headshells also have different attachment diameters depending on the manufacturer, so be careful as they can often break during installation. If it's too tight, widen the hole slightly before inserting. We have checked them thoroughly, and the terminals are harder than copper, so it is unlikely that they will break or deform during normal postal delivery. We have also tested them by dropping them and stepping on them with shoes, and they are usually fine unless intentionally damaged. Very rarely, there are cases where customers report that they were broken or deformed upon arrival. As stated in my profile, if you require insurance, please notify us to change the shipping method, as it will require an additional shipping fee. If you do not make a request, we are very sorry, but we cannot provide any warranty. MC Cartridge Step-up Transformer Turntable Analog Record Record Cartridge Phono Equalizer Tonearm Audio