Wrap Cores - 11 Pieces Manufacturers are not uniform. 9 cores are 16cm long and 3.2cm in diameter. 1 core is 23.3cm long and 2.6cm in diameter. 1 core is 30.7cm long and 2.6cm in diameter. Total: 11 pieces I kept these for crafting, so there is some slight dirt. The length and diameter are approximate measurements, so there may be slight errors. For crafting, etc. I had been hoarding these because I was sometimes suddenly asked to bring them from kindergarten or school! They fit snugly in an A4 envelope, so I will ship them directly in the envelope!