3 Sets Hairdressing Curly Hair Perm Cold Perm Screw Bar Hair Salon Supplies Color Random Delivery, Specification: Small Core1. Material: ABS2. Product Name: Screw Curling Bar3. Weight: small solid core (28 piecespack) about 110g, medium solid core (28 piecespack) about 205g, large solid core (25 piecespack) about 265g, hollow core (20 piecespack) about 155g , Large hollow core (15 piecespack) about 235g4. Dimensions: total length: 12cm, inner diameter: 0.5cm (small solid core); total length: 15.5cm, inner diameter: 0.6cm (medium solid core); total length: 18cm, inner diameter: 0.7cm (large solid core); total length: 15.5 cm, inner diameter: 1.2cm (hollow core); total length: 16.3cm inner diameter: 1.5cm (large hollow core)5. Reminder: Generally, you need 2 packs of sticks for whole head ironing6. Applicable scenarios: barber shop, home, etc.