20 piece strap lock set with two color options - Contains 20 pieces: 10 black and 10 red. Each lock is 2.5 cm (0.98 in) in outer size with an inner diameter of 1 cm (0.39 in), designed to replace worn or original strap locks. - High quality silica gel material: offers good stretch, is lightweight and soft, durable, and resistant to wear. Helps protect your guitar by securely holding straps without requiring drilling or screwing. Compatible with most strap buttons. - Easy installation: no tools needed. Slip the strap lock over the existing strap buttons; no need to replace strap buttons. The strap locks install quickly and hold the strap securely in place. - Reliable and low maintenance: no mechanical tools or parts that can fail. The rubber design reduces wear and tear, making these straps a practical accessory for most guitar players. - Practical use scenarios: ideal for live performances to prevent accidental strap detachment during energetic playing; suitable for rehearsals and practice with heavy movement; useful as a backup set for spare guitars or travel/tour setups.