Why does it be too far back or loose after it is fitted? That is because the stand slot of keyboards of some models is wider, so it will be that. In view of this situation, We attached a set of silicone gaskets with different thicknesses for it. When the slot is wider, you can use these silicone gaskets to stick on the support feet of the stand, so that it can better adapt to the width of the slot of your keyboard, And the stand can be fixed on your keyboard stably in the best angle. Model:KMS-003 Material: high quality ABS Product size: L 59 cm (23.23 in)×H 20.7 cm (8.15 in)×W 4.6 cm(1.8 in) 2 support intervals: 38cm ( 14.96 in ) Weight: About 800g. Compatible with Yamaha keyboards: ?KB291,290,281,280,191,190,181,155,220,320,309,130,90,210,160 ?PSR310,323,975,510,350,170,195 ? PSR-E453,443,433,423,363,353,343,333,263,253,243,233 ? PSR-S970,950,770,750,670,650,550,450 ? YPT360,340,260,255,240 ? EW300 ? NP31,11. Or other brand keyboards. Compatible with Yamaha digital pianos: ? P35, P45, P48, P71, P105, P115, P121, P125, P128 ? KBP-2000, KBP-1000 ? DGX-660, DGX-650, DGX-640. Or other brand digital pianos. Compatible with Roland digital pianos: FP10, FP30.