Rubber bands, approximately 430g. The number of bands is not counted. Sizes are mixed, but most are about 4cm in diameter. However, not all are the same size. These have been used once or a few times. I haven't thoroughly inspected them due to the large quantity. I've removed those that are obviously discolored or deteriorated, but it's not perfect. There may be dust or twisted bands. Please purchase only if you understand this.