This Ambar School A4 grid refill, with 100 sheets and 100gsm paper, is ideal for replenishing binders and ring binders with grid-organized paper, perfect for math, technical drawing, or structured notes. The high weight of 100gsm ensures comfortable and durable writing without transparency. With 100 sheets and universal hole punching, this Ambar School refill is an economical and sustainable option for those who prefer to reuse the same cover and only replace the paper insert throughout the year.