These are the cardboard cores from plastic wrap rolls. There are several different types. ◯ Length: approx. 46.5 cm, Diameter: approx. 3.5 cm, ❌ 2 pieces ◯ Length: approx. 38.0 cm, Diameter: approx. 3.8 cm, ❌ 1 piece ◯ Length: approx. 30.7 cm, Diameter: approx. 3.0-4.0 cm, ❌ 10 pieces ◯ Length: approx. 23.3-25.7 cm, Diameter: approx. 3.2-4.0 cm, ❌ 9 pieces ◯ Length: approx. 22.8-23.3 cm, Diameter: approx. 2.8-4.0 cm, ❌ 10 pieces ◯ Length: approx. 15.9 cm, Diameter: approx. 2.8-4.0 cm, ❌ 6 pieces Other: ◯ Length: approx. 11 cm, Diameter: 7.5 cm, ❌ 1 piece ◯ Length: approx. 22.4 cm, Diameter: approx. 3.5 cm, ❌ 1 piece (from marble chocolate) They will be sent as is, in a cardboard box. Thank you. Two of the 40 pieces have stickers or writing on them. Crafts, science projects, materials, DIY materials