Out of stock Felts / Protectors Square Plastic Inner End Cap 25x25 mm. Black Color Bag 200 Units. WOLFPACK LINEA PROFESIONAL AFT 05330524 €19.17 Square Plastic Inner Bead 25x25 mm. Black Color Bag of 200 Units. The Square Plastic Inner Ferrule is a versatile and practical accessory to protect the edges of the tubes and provide optimal support. Made of plastic (polyethylene) and grooved for greater grip, this ferrule has an external measurement of 25x25 mm and an internal measurement of 18x18 mm.... View