This is a pack of 10 T3.15AL250V glass cartridge fuses. They're rated for 3.15 Amps at 250 Volts. The \T\ usually means fast-blow (quick-acting), which is common for protecting sensitive electronics. These are the small cylindrical fuses with metal end caps. Brand is generic/unbranded. Brand new in packaging. If something in your older stereo, amplifier, power supply, or other electronic device stopped working, check for a blown fuse like this first. Having a few spares on hand is always smart – saves you a trip to the store when you need one urgently. A basic but essential component for any DIY repair kit or workshop. Cheap insurance against bigger problems!