Description These electric retracts work for jets in the 64-90mm jet size range, along with airplanes.  Wire struts do not come with the retracts due to being used with oleo struts.  It does come with a 15mm long, 5mm diameter pin that will fit into a strut. Oleo Struts are not included!!  JP Hobby ER-005 Oleo Struts will work with these retracts.  Retracts come with V1, also known as the A version control box. JP Hobby Retract Controller ER-120 V1 Manual Specifications Material: Aluminum Strut’s diameter: 10mm Pin Diameter Size: 5mm For plane: up to 6 kg/ 13 lb (possible 7-8kg) 90-degree rotation angle Technical Specifications Retracts weight: 2 x 62.8g 1 x 66g Control module version A, box weight: 19g Retract sizes: Depth 26mm x Length 73mm x  Width 18mm Retract mounting plate sizes: 33mm x 37mm Total Depth: 26 mm (From top of retract to bottom, including the mounting tabs) Control box version B sizes: 53mm x 32mm x 10mm Length with motor: 74mm Strut Pin Size: 5mm Working Voltage:  5 – 7.2V Speed: 5.2 sec (5v) – 4.3 sec (6v) Please pay attention that only JP Hobby sequencers are qualified to work in accordance with the JP Hobby products. Insurance Note:  Fan Jets USA recommends the purchase of shipping insurance. If insurance is not purchased and the package is lost or damaged, the most that can be claimed with the USPS and awarded to the purchaser (shipment recipient) is $50.00.  Fan Jets USA is not responsible for reimbursing the purchaser for the difference in an order of any amount.  Shipping charges are not included in an insurance claim per USPS guidelines. CA Residents: WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov